Longman Dictionary of Contemporary English homepage

unfounded

 adjective
     
un‧found‧ed
unfounded statements, feelings, opinions etc are wrong because they are not based on facts
unfounded rumours/claims/allegations etc
Unfounded rumours began circulating that Ian and Susan were having an affair.
prove (to be) unfounded
Sadly, my optimism proved unfounded.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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