an unfunny joke or action is not amusing, although it is intended to be – used to show disapproval 不滑稽的,不逗人发笑的,不幽默的〔含贬义〕
Examples from the Corpus
unfunny• I have told him that he is being very unfunny.• As you may have noticed, almost anyone in Hollywood can make an unfunny comedy.• He called Marro seven more times over the weekend to remind him just how unfunny it was.