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unthinkable
unthinking
unthought
unthread
untidy
untie
until
untimely
untiring
untitled
unto
untold
untouchable
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untrammeled
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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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