"Tetchily" is a word used to describe someone who is irritable and easily annoyed. Some synonyms for this word include testily, peevishly, petulantly, crabby, snappish, surly, grumpily, cantankerously, waspishly, and choleric. All of these words carry a similar meaning to "tetchily" and can be used to describe someone who is in a bad mood and quick to anger. It's important to choose the right word to convey the exact tone and emotion of a situation, so having a variety of synonyms for "tetchily" can be useful for writers and communicators alike.