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Definition of unreasonable

unreasonable

/ʌnˈriːzənəbəl/
un · rea · son · a · ble
Adverb:unreasonably
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unreasonable Lexical Profile

unreasonable Game Scores & Validity

• adjective

1

Not guided by or based on good sense, sound judgment, or fairness.

Example

"The manager realized it was unreasonable to expect the team to finish the entire project overnight."

2

Exceeding the bounds of what is normal, moderate, or acceptable in amount, price, or degree.

Example

"Several customers complained that the airline charged an unreasonable fee for checked luggage."

Synonyms
View all synonyms for unreasonable
Antonyms
View all antonyms for unreasonable

• Rhymes for unreasonable

• Nearby Words

unrealistically
unreality
unrealized
unreasonable
unreasonableness
unreasonably
unreasoning

Word Origin & Etymology

First recorded in the late 14th century, formed in Middle English by adding the prefix 'un-' to 'reasonable', which derives via Old French from the Latin 'rationabilis' ('endowed with reason').

Usage Trend

Historical frequency of usage in published text.

180019102020
Data source: Google Books Ngram Viewer

Cite this Entry

Wordmom. (2026). Definition of Unreasonable. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/unreasonable
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