Crossword Genius

Ill-founded, unreliable (7)

Ross

I believe the answer is:

unsound

(Other definitions for unsound that I've seen before include "Not strong or free from defect - perhaps evidence in court" , "Being crazy, sort of mind" , "Not reliable, like some evidence" , "Defective or flawed" , "Ill-founded" .)

I've seen this clue in the Sydney Morning Herald.
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