irascible

The story

1. Latin · derived fromīrāscī“to be angry, enraged”
2. Late Latin · derived fromīrāscibilis
3. Old French · derived fromirascible
4. English todayirascible

From Middle English, from Old French irascible, from Late Latin īrāscibilis, from Latin īrāscī (“to be angry, enraged”) + -bilis. See also -ible.