From Longman Dictionary of Contemporary Englishunfoundedun‧found‧ed /ʌnˈfaʊndɪd/ ●○○ AWL adjective REASONunfounded statements, feelings, opinions etc are wrong because they are not based on factsunfounded 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.
Examples from the Corpus
unfounded• All the signs indicate that the general's optimism is unfounded.• I am going to prove to you that your suspicions are entirely unfounded• Suspicions of a government cover-up are entirely unfounded.• Of the 40,000 asylum applications made last year, nine out of 10 were unfounded.• It turned out that my suspicions were unfounded, but all the time my memories were coming back.• We are amazed that a fellow professional has stooped so low as to make such unfounded comments in the papers.• Much of this toll is preventable, including that related to unfounded fears of infection.• He could hear his piping London voice with its parrot greetings and unfounded optimism.• They had hoped those fears would prove unfounded yesterday, but the rhetoric only got more vituperative.prove (to be) unfounded• But today, a year since John McCarthy's homecoming, their worst dread has proved unfounded.• R: Our initial fear that the Clause would spread proved to be unfounded.• Sadly, though, my optimism proved unfounded.• Survey calls time on fears Government concerns that the 1988 Licensing Act would encourage greater consumption of alcohol have been proved unfounded.• His fears eventually prove unfounded and she is reinstated, but not before the gym is ablaze.• If the allegation of infringement proves unfounded, there will have been no breach.• They had hoped those fears would prove unfounded yesterday, but the rhetoric only got more vituperative. 