Webster's English Dictionary

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unawares

un.awares \-'wa(*)rz, -'we(*)rz\ av [un- + aware + -s, adv. suffix, fr. ME, 
   fr. -s, gen. si]ng. ending of nouns - more at -S 1: without design, 
   attention, preparation, or premeditation  2: without warning : SUDDENLY, 
   UNEXPECTEDLY