adv
irrationally
adv
1
In a way that doesn't follow logic or reason.
"He reacted irrationally when told the flight was delayed."
How to Use Irrationally
Learner’s notesIn plain EnglishDoing or thinking something without a logical basis.
Word Forms
more irrationally comparative, most irrationally superlative
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He reacted _____ when told the flight was delayed.
Etymology
From irrational plus the adverb-forming suffix "-ly."