Use 'unfounded' to express strong disagreement or dismissal of an unsupported claim. The company dismissed the whistleblower's claims as unfounded.
Pro Tip 2/3
Speculation Rejection
'Unfounded' suggests that there is a lack of evidence behind a statement or belief. Rumors of the principal's retirement are unfounded.
Pro Tip 3/3
Sensitive Contexts
Using 'unfounded' can be sensitive; it often denies claims that may affect reputations. The police reported the allegations of misconduct to be unfounded.