irrational

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ir·ra·tion·al

(i-rash'ŭn-ăl),
Not rational; unreasonable (contrary to reason) or unreasoning (not exercising reason).
[L. irrationalis, without reason]
Farlex Partner Medical Dictionary © Farlex 2012

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.

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