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afflatus creative impulse; inspiration.
capricious tending to act on impulse; subject to whim or caprice; erratic and unpredictable.
compulsion an irresistible impulse, usu. to do or say something opposed by one's rational mind. [1/3 definitions]
effector a cell or an organ such as a muscle or gland that responds to a nerve impulse.
feeling (often pl.) a sentimental or romantic impulse. [1/9 definitions]
gratify to satisfy or indulge (a desire, impulse, or the like). [1/2 definitions]
motive an idea, need, desire, or impulse that causes a person to act in a particular way or do a particular thing; reason. [1/2 definitions]
nausea a stomach disturbance marked by vomiting or the impulse to vomit; queasiness. [1/2 definitions]
notion a fanciful idea or impulse. [1/3 definitions]
on the spur of the moment without much thought; on a sudden impulse.
reaction formation in psychoanalysis, the expression of a behavior that is opposite to a repressed impulse.
reuptake in physiology, the reabsorption of a neurotransmitter by a neuron following transmission of a nerve impulse.
spontaneous happening freely or done by impulse; not forced. [1/3 definitions]
sublimate to divert the expression of (a crude impulse or desire, often sexual) into a socially acceptable or more ideal form. [1/4 definitions]
Thanatos (often l.c.) in psychiatry, an instinct or impulse to seek peace in nonexistence, often manifested in aggressive behavior; death instinct. [1/2 definitions]
urge an involuntary or natural impulse or desire to do something. [1/7 definitions]
vasoconstriction constriction or narrowing of a blood vessel or vessels, as in response to a nerve impulse.
vasodilation dilation or widening of a blood vessel or vessels, as in response to a nerve impulse.
whim a sudden odd or capricious desire, impulse, notion, or change of mind; whimsy; caprice.