irrationally

[ ih-rash-uh-nl-ee, -rash-nl- ]
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adverb
  1. in a way that is contrary to reason or is not sensible; illogically: In firing a highly competent CEO without cause, the Board acted unlawfully, unreasonably, and irrationally.Stick to your simple calculation and logic, even when markets are behaving irrationally.

  2. in a way that is driven by impulse or instinct rather than reason; without having or being able to use the faculty of reason: When a reporter started poking around, the suspect began acting irrationally and took off like a wild animal.

Origin of irrationally

1
First recorded in 1640–50; irrational + -ly

Other words from irrationally

  • non·ir·ra·tion·al·ly, adverb

Words Nearby irrationally

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024

How to use irrationally in a sentence