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well-founded

[wel-foun-did] /ˈwɛlˈfaʊn dɪd/
adjective
1.
having a foundation in fact; based on good reasons, information, etc.:
well-founded suspicions.
Origin of well-founded
1325-1375
Middle English word dating back to 1325-75
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for well-founded

well-founded

adjective (well founded when postpositive)
1.
having good grounds: well-founded rumours
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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