A wry remark or piece of writing refers to a bad situation or a change in a situation in an amusing way. There is a wry sense of humour in his work. a wry expression or wry humour shows that you know a situation is bad, but you also think it is slightly amusing (wry (14-19 centuries), from wrigian )
If someone has a wry expression, it shows that they find a bad situation or a change in a situation slightly amusing. Matthew allowed himself a wry smile