Adjective
/ˈground-lis/,

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Not based on any good reason,
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Not based on any good reason
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your fears are quite groundless
Web Definitions:
- baseless: without a basis in reason or fact; "baseless gossip"; "the allegations proved groundless"; "idle fears"; "unfounded suspicions"; "unwarranted jealousy"
- (groundlessness) the quality of lacking substance or value; "the groundlessness of their report was quickly recognized"