"irascible" in the adjective sense
1. choleric, irascible, hotheaded, hot-tempered, quick-tempered, short-tempered
quickly aroused to anger
"a hotheaded commander"
2. choleric, irascible
characterized by anger
"a choleric outburst"
"an irascible response"
Source: WordNet® (An amazing lexical database of English)
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