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ill-founded (comparative more ill-founded, superlative most ill-founded)

  1. Unsubstantiated, not based on fact or evidence.
    Synonyms: baseless, flimsy, groundless, unjustified
    Antonym: well-founded
    ill-founded criticism
    • 1814, Cobbett's Parliamentary History of England: From the Norman Conquest, in 1066 to the Year 1803., page 1155:
      He said, the part of the sentence which stated that the court “having heard the evidence, and maturely and seriously considered the whole, are of opinion that the charge is malicious and ill-founded: []