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unsuccessful
unsuitable
unsung
unsupportable
unsure
unsurprising
unsuspected
unsuspecting
unswerving
untangle
untapped
untaught
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untenable
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untiring
un·tir·ing [ un tring ]


adjective 
Definition:
 
1. not becoming tired: not growing weary or exhausted
2. going on: continuing in spite of difficulty or frustration
her untiring efforts

un·tir·ing·ly adverb
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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