Having no strong foundation; not based on solid reasons or facts. (adjective)
Examples of word unfounded
Mr. da Silva, who is using his immense popularity to lift his former chief-of-staff Ms. Rousseff into the presidency, appeared on television this week to defend Ms. Rousseff against what he described as unfounded attacks.
Our critics seem to shudder at what they call unfounded personal attacks.
Ngonyama said the DP had numerous platforms to use before running to the media with what he called unfounded allegations.
Newspapers, for undisclosed damages over what it called "unfounded rumours".
Pitino hopes the extension ends what he called unfounded speculation that he's considering leaving the Cardinals in pursuit of another job.