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unstoppable

[uhn-stop-uh-buh l]
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adjective
  1. that cannot be stopped or surpassed; unbeatable: an unstoppable ball team.

Origin of unstoppable

First recorded in 1830–40; un-1 + stoppable
Related formsun·stop·pa·bly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for unstoppably

unstoppable

adjective
  1. not capable of being stopped; extremely forceful
Derived Formsunstoppably, adverb
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

Word Origin and History for unstoppably

unstoppable

adj.

1836; see un- (1) "not" + stop (v.) + -able.

Online Etymology Dictionary, © 2010 Douglas Harper