groundlessground‧less /ˈɡraʊndləs/ adjective 
Fortunately my suspicions proved groundless. Mr Kay’s lawyer said the accusations were groundless.
EXAMPLES FROM OTHER DICTIONARIES
- A message from Interpol confirmed that our Inspector's suspicions were far from groundless.
- Fleury dismissed our fears as groundless, though he was secretly alarmed.
- The charges against him are groundless.
- But their fear is groundless, I do have to say.
- Fears that radiotherapy would cause genetic mutations leading to handicaps in offspring appear to be groundless, according to studies among 3,000 survivors.
- On the face of it, these fears are groundless.
- Such groundless critiques, however, have contributed to the perception of Washington as a Neanderthal man.
- Such awards are made to discourage plaintiffs from bringing groundless lawsuits which burden the courts.
- The assumption is groundless both theoretically and empirically.
- The distinction between the arbitrary and the suggestive is ultimately groundless.
- This suggests that some previous doubts are groundless.
Longman Language Activatorwhen there is no reason for someone's behaviour
use this to say that there is no reason for someone to think or behave in a particular way: be no reason to do something: · I know I'm late, but that's no reason to lose your temper.there is no reason for something: · Please remain calm everyone. There is no reason for panic.
use this to say that there is no acceptable reason for someone to think or behave in a bad or unfair way. Be no justification is more formal than be no excuse: · "But she started it." "That's no excuse."be no excuse/justification to do something: · Ron may not be the most pleasant person to work with, but that's no justification to fire him.there's no excuse/justification for something: · There's no excuse for such childish behaviour from a grown man.
groundless fears, suspicions etc that are unnecessary because there are no facts to base them on: · Fleury dismissed our fears as groundless, though he was secretly alarmed.· A message from Interpol confirmed that our Inspector's suspicions were far from groundless.
worries, fears, hopes etc that are unfounded are wrong because there are no reasons to have these feelings: · I am going to prove to you that your suspicions are entirely unfounded.· All the signs indicate that the general's optimism is unfounded.
COLLOCATIONS FROM THE ENTRY Fortunately my suspicions proved groundless.COLLOCATIONS FROM OTHER ENTRIES
not based on facts or reason OPP well-founded: Fortunately my suspicions proved groundless. (=not based on facts or reason)· The accusation is totally unfounded.· The embassy denied what it called groundless accusations about its involvement in the attack.
(=without any reason)· As it turned out, these fears were groundless.
Fortunately my suspicions proved groundless. Mr Kay’s lawyer said the accusations were groundless.