Definition of groundless adjective from the Oxford Advanced Learner's Dictionary

 

groundless

 adjective
adjective
BrE BrE//ˈɡraʊndləs//
 
; NAmE NAmE//ˈɡraʊndləs//
 
 
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not based on reason or evidence synonym unfounded groundless allegations Our fears proved groundless. Their suspicions were dismissed as groundless. Word Origin Old English grundlēas (see ground, -less).Extra examples Most of his worries proved to be groundless. They denied what they called completely groundless allegations. unfounded/​groundless claims/​allegations/​accusations/​fears/​worries
See the Oxford Advanced American Dictionary entry: groundless