"Waspier" is a word that denotes a personality trait that is marked by irritable, angry, or hostile behavior. If you're looking for synonyms to describe this trait, you might consider words such as cantankerous, irascible, prickly, or testy. Other options might include crabby, cross, grouchy, grumpy, irritable, or short-tempered. Each of these words conveys a similar sense of irritation or agitation, though some may be more appropriate in certain contexts or with certain audiences than others. Ultimately, the best synonym for "waspier" may depend on the specific context in which the word is being used.