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- Factual 241
- sclerosis 59
- stand up 244
- tailoring 132
- nob 75
- edifice 93
- Rape 194
- Turk 68
- multiplex 68
- pedant 75
- in- 86
- Mold 91
- crank 114
- smelling salts 84
- To go somewhere, or to move in a particular direction 150
- saltwater 51
- gang-rape 92
- Historically 172
- checkered 109
- Counterfeit 113
- brisk 581
- far-flung 76
- prefer 775
- hard court 69
- proofread 186
- goof 129
- rosette 47
- incursion 69
- skirmish 99
- fair-haired 81
- sunni 48
- conscription 145
- car boot sale 118
- Nauru 51
- peruse 245
- Dimension 138
- squad car 107
- blank check 113
- defuse 169
- macro- 141
- gawk 143
- downfall 181
- hateful 522
- brush 459
- fancy dress 101
- grow on 138
- freedom 762
- émigré 300
- cctv 88
- claptrap 100
- stair 653
- handgun 64
- paternalism 67
- carotid artery 116
- question mark 63
- underscore 194
- oilman 60
- frig 116
- munch 220
- yonder 81
- unpromising 55
- homeboy 62
- barber 527
- Suitable 691
- trustee 70
- Sap 528
- make no mistake (about it) 66
- Honour 280
- entourage 116
- protease 57
- gymnast 114
- tantalize 181
- breast 661
- electronic book 84
- home town 212
- consultancy 140
- gymnastic 201
- cellist 90
- outreach 140
- Jeeves 57
- indignant 601
- bronchial 119
- seat 783
- micropower 59
- groundswell 123
- smarten 60
- houseparent 41
- vacuum 569
- sprite 53
- evaporate 513
- lodestone 145
- burgher 113
- intractable 86
- homophonous 51
- Puberty 50
- a small fortune 3
- neutral 672
- zeitgeisty 49
- Cellophane 73
- Culture 450
- strait 427
- sociopolitical 54
- checkout 215
- Alchemist 87
- cupola 102
- Series 241
- correctness 102
- journalist 621
- Fauna 184
- Food 323
- roil 82
- clock in 135
- by far 171
- acting 383
- paddle steamer 143
- reverie 239
- top-flight 82
- lure 345
- shall 169
- pakeha 62
- dishonest 204
- Eye-opener 115
- repurpose 96
- collie 120
- squeak 284
- fiancée 95
- bathroom 594
- squint 134
- illumination 163
- fibre-optic 79
- unnatural 65
- Addictive 212
- legislation 590
- come into contact (with) 79
- burdensome 121
- Attire 163
- Fortuitous 85
- aflame 112
- Thoughtful 271
- DOMINANT 133
- flying fish 91
- befallen 90
- just 277
- abundance 202
- pregnant 188
- spoken 165
- amidships 118
- tart 238
- largesse 195
- cash in 126
- talented 200
- dwarfism 113
- collector 221
- collector's item 124
- Instead or instead of 6
- kathakali 59
- catbird seat 122
- corned beef 136
- print out 60
- airspace 134
- headship 71
- MIST 150
- pedicure 49
- sextant 54
- vasoconstriction 58
- follow 1046
- Complement 101
- Authority 757
- electrocardiograph 96
- crusader 101
- Not 81
- mescalin 57
- courtesy 163
- litigious 161
- diva 141
- apocryphal 94
- governor general 92
- creator 83
- Business 50
- grasp 930
- actuality 85
- pipework 56
- First 138
- recollection 304
- hereditament 56
- over and over (again) 72
- Tenement 26
- teem with 89
- motorcycle 188
- Colours - thesaurus 155
- mainline 65
- mah-jongg 44
- defecate 122
- maniac 326
- hallelujah 106
- top-heavy 107
- full-grown 226
- affricate 101
- graphical 93
- assumed name 265
- run through 114
- the Civil List 89
- enforced 114
- brand 672
- mess 928
- inaugurate 207
- empathy 702
- Benign 24
- ravish 70
- cornet 150
- jack-o'-lantern 72
- dot matrix printer 90
- bicoastal 116
- calibration 92
- Exorcise 31
- Instrument 208
- grinder 111
- imprecision 49
- writing 965
- crackdown 490
- perfect storm 125
- pleasant 761
- Clover 118
- foresight 211
- Spirited 51
- hieroglyphics 48
- blizzard 177
- guillotine 119
- decider 89
- mismanage 178
- send in 112
- russian 72
- unfrequented 61
- Christian Science 111
- col 105
- the body politic 76
- Perch 17
- floor plan 41
- tmt 52
- Optician 11
- articulation 106
- Measles 27
- disagreeable 91
- divine right 104
- meitnerium 50
- softwood 48
- Glowing 179
- ailment 212
- Weasel 26
- confessional 114
- notecard 55
- Child 521
- chill 1039
- desertion 158
- playgroup 73
- Accent 305
- shri 47
- pan out 50
- Suspend 406
- pressure cooker 89
- veto 453
- press gang 51
- controllable 108
- cryogenics 118
- tomorrow 68
- direct mail 108
- eek 129
- self-confidence 243
- Impressionism 148
- Odds 98
- dial-up 436
- fervour 176
- Humble 575
- manicurist 53
- muscovado 50
- bract 147
- adventure playground 108
- sag 75
- commandeer 199
- coalfield 131
- frack 178
- Allay 14
- insulting 224
- double-sided 133
- Acorn 57
- ability 839
- overact 55
- hen 603
- bowl out 118
- globe-trot 93
- drongo 95
- go around round in circles 88
- resourceful 224
- Expositions and shows 87
- commuter belt 114
- To cause problems for someone or something 189
- barbarism 116
- Expected 138
- green onion 146
- Lacerate 60
- sotho 41
- Shoreline 195
- taoism 45
- Alt key 75
- bad guy 125
- solitary 314
- emphatic 238
- fact 1225
- sand bar 75
- serial 201
- Sullen 164
- naval 440
- fire away 71
- awaken 145
- euphoric 223
- double bind 127
- grammy 100
- non-aligned 56
- seaborgium 42
- fortified wine 126
- counterclockwise 80
- front-page 98
- fandango 100
- cold comfort 144
- bearable 123
- Macedonia 46
- dryad 117
- fieldmouse 75
- Evacuate 272
- ooh 61
- Constructive 46
- Bleach 118
- surrogate 138
- salient 195
- Incense 13
- muggins 59
- deluxe 165
- voltage 515
- xhosa 55
- grenade 169
- zero carbon 84
- leech 145
- recline 114
- digital camera 118
- salt shaker 75
- roadworthy 119
- shortcoming 540
- Function 318
- metaphysics 124
- ramrod 153
- hematology 91
- astronomically 156
- crossroads 161
- short cut 168
- widow 567
- pigment 106
- Ramshackle 116
- mentee 52
- -free 148
- horrid 72
- shiny 61
- em 137
- fertile 645
- Vietnam 111
- metaphor 375
- front desk 114
- lollop 53
- epidural 128
- gullible 182
- cow town 87
- clawback 98
- defender 297
- Merchant 131
- tidal 59
- reverberation 53
- offend 889
- chalk 490
- Promotion 105
- sidestep 75
- crank out 138
- interpose 47
- transportation 510
- Settler 114
- handset 120
- Physical sensations and movements in response to emotions 89
- Liaison 178
- Secret 1505
- Workable 139
- airy fairy 135
- massif 64
- Frame 287
- Trace 507
- brevity 616
- dignify 108
- nun 65
- demonstrator 315
- severity 101
- Camera 78
- pulp 57
- sales clerk 69
- Entryphone 64
- carbon 538
- code of practice 128
- Kazakh 47
- dissatisfied 295
- ablaze 189
- come down on 167
- evaporated milk 124
- govern 712
- gormless 98
- Agree with 175
- Streamline 124
- Stray 303
- lead on 107
- army 1004
- cytology 94
- misplay 47
- throw yourself at someone 47
- starvation 621
- Attach 279
- Array 288
- icq 62
- Burqini 71
- Ways of explaining or clarifying 158
- gabfest 76
- slavish 68
- protected 55
- tarty 61
- Motivated 107
- sinus 49
- fomo 68
- cortège 71
- the first family 104
- marquee 227
- cream off 80
- clear up 111
- Parent 89
- shinbone 50
- GREAT 135
- Balanced 19
- marigold 54
- jailhouse 65
- Armed 105
- defra 101
- hard-headed 50
- insect 542
- commanding 113
- come out 191
- fiddlesticks 95
- miscount 72
- seaboard 56
- Bearish 52
- come up for 89
- employability 104
- arctic 166
- quartermaster 43
- Assassin 50
- reproduce 655
- package holiday 42
- penknife 59
- make sense 57
- Unprecedented 75
- crenellated 113
- bluster 137
- goodbye 172
- submersed 61
- maharani 51
- laugh 484
- Giveaway 112
- shoulder blade 93
- Able to be changed and lasting only a short time 73
- hard-earned 254
- venerate 73
- overtired 55
- homogeneous 292
- Outlying 122
- Static 227
- Otherworldly 109
- economy 769
- countable 189
- gap-toothed 88
- mistook 52
- descend 540
- Likelihood 124
- jailbird 60
- preferential 80
- oncology 65
- In short 41
- biblical 113
- hunch 307
- Purposeful 184
- dissolve into 126
- indian 85
- widget 48
- Referee 377
- punishment 905
- Bushman 75
- emend 124
- classified ad 93
- Represent 565
optional
★
adjective 
/ˈɒpʃ(ə)nəl/
/ˈɒpʃ(ə)nəl/ - something that is optional is available or possible if you want it, but you do not have to have it or do it 可选的；非强制的
Add 200 grammes of walnuts (optional). 加200克的胡桃（可选）。
The history course is optional, but English is compulsory. 历史课是选修的，但英语课是必修的。
an optional extra (=something that is available, usually for more money) （通常指需另交费的）额外可选之物 :Remote central locking comes as an optional extra. 遥控中央门锁是可供选择的额外配置。
Synonyms and related wordsAvailable and to be, or to become available: available, public, spare...
derived word
optionally
adverb Synonyms and related words
Available and to be, or to become available: available, public, spare...
adjective
optional adj.
⇨ voluntary 1
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