[ree-zuh-nuh-buhl, reez-nuh-]


agreeable to reason or sound judgment; logical: a reasonable choice for chairman.
not exceeding the limit prescribed by reason; not excessive: reasonable terms.
moderate, especially in price; not expensive: The coat was reasonable but not cheap.
endowed with reason.
capable of rational behavior, decision, etc.

Origin of reasonable

1250–1300; Middle English resonable < Middle French raisonnable < Latin ratiōnābilis. See reason, -able
Related formsrea·son·a·ble·ness, rea·son·a·bil·i·ty, nounrea·son·a·bly, adverbhalf-rea·son·a·ble, adjectivehalf-rea·son·a·bly, adverbnon·rea·son·a·bil·i·ty, nounnon·rea·son·a·ble, adjectivenon·rea·son·a·ble·ness, nounnon·rea·son·a·bly, adverbqua·si-rea·son·a·ble, adjectivequa·si-rea·son·a·bly, adverb
Can be confusedrational reasonable (see synonym study at the current entry)

Synonyms for reasonable

1. intelligent, judicious, wise, equitable. Reasonable, rational refer to the faculty of reasoning. Rational can refer to the reasoning faculty itself or to something derived from that faculty: rational powers; a rational analysis. It can also mean sane or sensible: She was no longer rational; a rational plan. Reasonable most often means sensible: A reasonable supposition is one which appeals to our common sense. 2. equitable, fair, just. See moderate. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for reasonableness

Contemporary Examples of reasonableness

Historical Examples of reasonableness

  • He had been surely a reasonable man, and his reasonableness had led him to this hour.

    A Spirit in Prison

    Robert Hichens

  • Above all things, I think I can say that with all reasonableness I have held to the truth.

    Adventures and Recollections

    Bill o'th' Hoylus End

  • The reasonableness of our conduct, one further reflection may make clear.



  • She had not the slightest doubts as to the reasonableness of this performance.

    The Memoires of Casanova, Complete

    Jacques Casanova de Seingalt

  • He shall be taught the reasonableness of Christianity, and the nothingness of disbelief.

British Dictionary definitions for reasonableness



showing reason or sound judgment
having the ability to reason
having modest or moderate expectations; not making unfair demands
moderate in price; not expensive
fair; averagereasonable weather
Derived Formsreasonably, adverbreasonableness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for reasonableness



c.1300, "having sound judgment, sane, rational," from Old French raisonable, from Latin rationabilis, from ratio (see reason (n.)).

What the majority of people consider to be 'reasonable' is that about which there is agreement, if not among all, at least among a substantial number of people; 'reasonable' for most people, has nothing to do with reason, but with consensus. [Erich Fromm, "The Heart of Man," 1968]

Meaning "moderate in price" is recorded from 1660s. Related: Reasonably.

Online Etymology Dictionary, © 2010 Douglas Harper

Idioms and Phrases with reasonableness


see beyond a (reasonable) doubt.

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.