Crossword Genius

Untrue; erroneous

Ross

I believe the answer is:

fallacious

I believe this is a double definition.

'untrue' is the first definition.
(thesaurus)

'erroneous' is the second definition.
(thesaurus)

(Other definitions for fallacious that I've seen before include "Like a mistaken belief" , "Deceptive, misleading" , "Incorrect" , "Flawed" .)

I've seen this clue in The Mirror.
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