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uncommonly
uncommunicative
uncomplicated
uncompromising
unconcern
unconcerned
unconditional
unconditioned
unconditioned stimulus
unconfined
unconformable
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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
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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