There are several synonyms for the phrase "bad temper" that can be used to describe someone who is irritable, impatient or easily angered. Some of these synonyms include "short fuse," "hot-headed," "cranky," "testy," "irascible," "peevish," "grumpy," "cantankerous," "ornery," "cross," "petulant" and "surly." Each of these words carries a slightly different connotation, but all suggest a person who is prone to outbursts or who is generally unpleasant to be around. If someone you know is consistently exhibiting these traits, it may be a sign that they need a break or some help managing their stress levels.