Not based on fact or sound evidence; groundless. See Synonyms at baseless.(adjective)
Not yet established.(adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "unfounded" in a sentence
"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."