Crossword Genius

Concave (6)

Ross

I believe the answer is:

hollow

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">concave</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

(Other definitions for hollow that I've seen before include "Dent; echoey" , "Insincere; not solid" , "Not solid, having hole in the middle" , "Empty, not solid" , "Empty - insincere" .)

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