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unconstitutional
uncontrollable
unconventional
uncool
uncoordinated
uncork
uncount noun
uncountable
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unconditioned stimulus
un·con·di·tioned stim·u·lus (plural un·con·di·tioned stim·u·li)


noun 
Definition:
 
stimulus that evokes reflexive response: a stimulus that evokes a reflexive response without prior conditioning or learning
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