petulant vs testy

petulant and testy both are adjectives.

Word	Noun	Adjective	Verb	Adverb
petulant	No	Yes	No	No
testy	No	Yes	No	No

As adjectives, petulant and testy are synonyms defined as:

Other synonyms of petulant include cranky, fractious, irritable, nettlesome, peckish, peevish, pettish, scratchy, techy, tetchy.

petulant (adjective)	testy (adjective)
easily irritated or annoyed	easily irritated or annoyed