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irrational Synonyms

Another word for irrational

Choosing another word for irrational depends on context, so the 17 synonyms and similar words below are separated across 4 exact definitions and ranked by match strength.
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• adjective (Context 1)

Not logical or reasonable; governed by emotion or impulse rather than clear thought or sound judgment.

Usage Example

"The sudden drop in stock prices was driven by illogical panic among investors rather than economic fundamentals."

Strongest
illogical
unreasonable
Strong
unfounded
baseless
groundless
absurd
nonsensical
senseless
preposterous
incoherent

• adjective (Context 2)

Incapable of being expressed as a ratio of two integers, and therefore having an infinite, non-repeating decimal expansion (of a real number or mathematical quantity).

Usage Example

"Ancient Greek mathematicians were famously troubled by the discovery that the square root of two is an incommensurable value."

Strong
incommensurable
surd

• adjective (Context 3)

Not endowed with the capacity for reason or logical thought.

Usage Example

"Classical philosophers often drew a sharp distinction between human beings and what they considered unreasoning beasts."

Strongest
unreasoning
nonrational
Strong
brute
instinctive

• noun (Context 4)

A real number that cannot be expressed as a simple fraction or ratio of two integers.

Usage Example

"In advanced calculus, students learn how the irrationals fill the gaps between rational numbers on the real number line."

Strongest
irrational number
Strong
surd

Opposites of irrational

The opposite of irrational shifts depending on context. Common opposites include:

rational
reasonable
logical
reasoning
sensible
sapient
level-headed
sound
See all opposites of irrational

Cite this Entry


Wordmom. (2026). Synonyms for Irrational. In Wordmom Thesaurus. Retrieved Nov 5, 2026, from https://wordmom.com/synonyms/irrational
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