Origin: 1350–1400; ME
irascibel < LL
īrāscibilis, equiv. to L
īrāsc- (s. of
īrāscī to grow angry; equiv. to
īr(
a)
ire +
-ā- theme vowel +
-sc- inchoative suffix +
-ī inf. ending;
see -esce ) +
-ibilis -ible 
Related forms: i⋅ras⋅ci⋅bil⋅i⋅ty, i⋅ras⋅ci⋅ble⋅ness, noun
i⋅ras⋅ci⋅bly, adverb
Synonyms:1, 2. testy, touchy, peppery, choleric, short-tempered.
See irritable. Antonyms:
1, 2. calm, even-tempered.