Where does “irascibly” come from?
irascibly (English) comes from English irascible, from French irascible, from Latin īrāscibilis, from Latin īrāscor, from Latin īrātus, from Latin īra, from Latin eira, from Proto-Italic eisā — to propel; to move quickly.
irascibly (English): In an irascible manner
Ancestry of “irascibly”, step by step