informala noble action is one that you do to help other people, rather than for yourself. This word often shows that you don't think something is noble at all (行为)高尚的(该词常表示认为某事根本不高尚)
It was very noble of you to help. 你来帮忙真是太好了。
‘Jack's offered to look after the kids.' ‘How noble of him!' “杰克提出由他来照顾孩子们。”“他可真高尚啊!”