having a foundation in fact; based on good reasons, information, etc.: well-founded suspicions.

Origin of well-founded

Middle English word dating back to 1325–75
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Related Words for well-founded

factual, solid, proven, substantiated

Examples from the Web for well-founded

Contemporary Examples of well-founded

  • Kim now knows the “well-founded fear” that asylum seekers must prove they have to be accepted by a host country.

    The Daily Beast logo
    The Canadian Faulkner

    Tom LeClair

    June 24, 2013

  • Assumptions that the Republican nominee automatically wins statewide office in South Carolina are well-founded but not uniform.

    The Daily Beast logo
    A GOP Star Falters

    John Avlon

    October 16, 2010

  • “His language is off the scale but his sense of injustice is often well-founded,” Ralph Nader told the Beast.

    The Daily Beast logo
    Jerry Brown's Worst Enemy

    Benjamin Sarlin

    March 2, 2010

  • There was no proof at all, nothing to link him to the crime except some well-founded suspicion.

    The Daily Beast logo
    John Grisham's Debut Short Story

    John Grisham

    October 26, 2009

Historical Examples of well-founded

British Dictionary definitions for well-founded


adjective (well founded when postpositive)

having good groundswell-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