noun or participle which takes 'suru', noun, adverb, adverb taking the 'to' particle, intransitive verb
irritated; annoyed; frustrated; on edge
Describes a state of irritation or impatience, often from small annoyances. Used as a noun, する verb, or adverb with と.
電車が遅れてイライラした。
I got irritated because the train was late.
彼はイライラしながら待っていた。
He was waiting impatiently, feeling annoyed.