irrational

ir·ra·tion·al

(i-rash'ŭn-ăl),

Not rational; unreasonable (contrary to reason) or unreasoning (not exercising reason).

[L. irrationalis, without reason]

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irrational

(ĭ-răsh′ə-nəl)

adj.

a. Not endowed with reason.

b. Affected by loss of usual or normal mental clarity; incoherent, as from shock.

c. Marked by a lack of accord with reason or sound judgment: an irrational dislike.

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ir·ra′tion·al·ly adv.

ir·ra′tion·al·ness n.

The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

irrational

adjective Unreasonable, illogical

McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.

ir·ra·tion·al

(ir-rash'ŭn-ăl)

Not rational; unreasonable (contrary to reason) or unreasoning (not exercising reason).

[L. irrationalis, without reason]

Medical Dictionary for the Health Professions and Nursing © Farlex 2012