Adjective
/ˌənˈfoundid/,

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Having no foundation or basis in fact, 
                    
                    
                        
        
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Having no foundation or basis in fact
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her persistent fear that she had cancer was unfounded
                                            
 
 
 
                     
 
 
Web Definitions:
 
 
 
 
- baseless: without a basis in reason or fact; "baseless gossip"; "the allegations proved groundless"; "idle fears"; "unfounded suspicions"; "unwarranted jealousy"
- Having no strong foundation; not based on solid reasons or facts
- (unfoundedly) In an unfounded way; without basis
- Term used to describe an allegation that is spurious or patently without factual basis.