IPA: //ɪˈreɪtɛst//
KK: /ɪˈreɪtɛst/
The highest degree of being very angry or annoyed.
After hearing the news, she was in her iratest mood ever.
Comparative: more irate
Superlative: iratest
This word originates from Old English, meaning the act of expressing anger or annoyance. The term 'iratest' is a superlative form of 'irate', which comes from Latin 'iratus', meaning angry.
Think of the word 'irate' which means angry, and remember that 'iratest' refers to the highest degree of anger.