"testier" in the adjective sense
1. cranky, fractious, irritable, nettlesome, peevish, peckish, pettish, petulant, scratchy, testy, tetchy, techy
easily irritated or annoyed
"an incorrigibly fractious young man"
"not the least nettlesome of his countrymen"
Source: WordNet® (An amazing lexical database of English)
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