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tireless

[tahyuh r-lis] /ˈtaɪər lɪs/
adjective
1.
untiring; indefatigable:
a tireless worker.
Origin of tireless
1585-1595
1585-95; tire1 + -less
Related forms
tirelessly, adverb
tirelessness, noun
Synonyms
unwearied, industrious, hardworking, unfaltering.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for tireless

tireless

/ˈtaɪəlɪs/
adjective
1.
unable to be tired; indefatigable
Derived Forms
tirelessly, adverb
tirelessness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for tireless
adj.

1590s, "indefatigable," from tire (v.) + -less. From 1862 in the sense "without a tire," from tire (n.). Related: Tirelessly.

Online Etymology Dictionary, © 2010 Douglas Harper
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8
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