Definition of unfounded adjective from the Oxford Advanced Learner's Dictionary

  

unfounded

 adjective
adjective
BrE BrE//ʌnˈfaʊndɪd//
 
; NAmE NAmE//ʌnˈfaʊndɪd//
 
 
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not based on reason or fact unfounded allegations/rumours, etc. Speculation about a divorce proved totally unfounded.Extra examples These claims were completely unfounded. These claims were not altogether unfounded. I dismissed the story as unfounded speculation. I was pleased to discover that my fears were unfounded. These allegations are completely unfounded.
See the Oxford Advanced American Dictionary entry: unfounded