Meaning of the word irrationally in English

What does irrationally mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

irrationally

US /ɪˈræʃ.ən.əl.i/
UK /ɪˈræʃ.ən.əl.i/

Adverb

in a way that is not based on clear thought or reason

Example:
She reacted irrationally to the news, bursting into tears.
He tends to act irrationally when he's under pressure.