The collection of antonyms for the word 'good-humoredness' can be quite extensive since this word encompasses the idea of being cheerful, friendly, and positive. The antonyms of this word contain the opposite meanings that can often describe someone who is ill-tempered, surly, and unpleasant to be around. Some possible antonyms include bad-tempered, irritable, grouchy, unfriendly, and harsh. In comparison to a person who exhibits good-humoredness, those who possess these antonyms could be difficult to approach or interact with, and their attitudes may rub off on those around them. Thus, having good-humoredness can help to create a positive environment where others feel happy and at ease.