Part of speech: adjective

Groundless; baseless.

Part of speech: adjective

Not founded or established.

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Usage examples "unfounded":

  1. Yes; we had reasons, but they prove to have been unfounded. - "Cynthia Wakeham's Money", Anna Katharine Green.
  2. This charge has been particularly made against the Creeks, and I believe is not altogether unfounded. - "A Ramble of Six Thousand Miles through the United States of America", S. A. Ferrall.
  3. All these reports appear to have been equally and entirely unfounded. - "Journal of an African Cruiser", Horatio Bridge.