Crossword Genius

Hanging by a thread

Ross

I believe the answer is:

tenuous

(Other definitions for tenuous that I've seen before include "Slender - insubstantial" , "Very slight, with little substance or validity" , "Very thin in form, having little validity" , "Thin - slight" , "Very weak or slight" .)

I've seen this clue in The New York Times.
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