“Baseless” in Japanese
Short answer
Baseless in Japanese is “無根拠” (mukonkyo). Full meaning: baseless, groundless, unfounded, without evidence.
Other ways to say “Baseless” in Japanese
根拠のない
konkyononai baseless, groundless
無稽
mukei unfounded, groundless, baseless, absurd, nonsensical
根も葉もない
nemohamonai groundless (rumour, accusation, etc.), unfounded, baseless, without a shred of truth
謂れ無い
iwarenai unjustified, unwarranted, unfounded, baseless, groundless
謂れのない
iwarenonai unjustified, unwarranted, unfounded, baseless, groundless
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