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|Noun||1.||irrational motive - a motivation that is inconsistent with reason or logic|
motivation, motive, need - the psychological feature that arouses an organism to action toward a desired goal; the reason for the action; that which gives purpose and direction to behavior; "we did not understand his motivation"; "he acted with the best of motives"
irrational impulse - a strong spontaneous and irrational motivation; "his first impulse was to denounce them"; "the urge to find out got him into trouble"