There are several synonyms for the term "bad-humoured" which can be used to describe someone who is in a foul or irritable mood. Some common alternatives to this word include "cranky", "grumpy", "cross", "testy" and "unpleasant". Other words that can be used to describe someone with a bad mood include "sullen", "surly", "morose", "petulant", "irritated", "grouchy", "cantankerous" and "ornery". Each of these words conveys a slightly different mood or tone, but all imply that the person in question is not in a pleasant state of mind and may be difficult to deal with.