feeling tired and not able to think quickly, especially because you have been given drugs to take away your pain or to make you sleep (尤指服用止痛药或安眠药后)昏昏沉沉的
He had the operation only this morning, so he's still feeling a bit dopey. 他今天上午才做了手术,所以仍感觉有点昏昏沉沉的。