The phrase "like a bear" is often used to describe someone who is grumpy, irritable, or rough. Synonyms for "like a bear" may include "gruff," "testy," "cranky," "crusty," "surly," "grouchy," "ill-tempered," and "fierce." These words denote someone who is easily annoyed, short-tempered, or aggressive in their behavior. Other related phrases to describe someone who is like a bear may include "growling like a bear," "bearing their teeth," and "having a bear-like temperament." Regardless of the words used, it is clear that when someone is referred to as "like a bear," they are not in the best of moods.