Crossword Genius

Insincerity of heartless state? (10)

Ross

I believe the answer is:

hollowness

I'm a little stuck... Click here to teach me more about this clue!

This clue might be a double definition.

'insincerity' is the first definition.
(thesaurus)

'heartless state?' is the second definition.
'hollowness' can be an answer for 'state?' (hollowness is a kind of state). I am not certain of the 'heartless' bit.

'of' acts as a link.

Can you help me to learn more?

I've seen this clue in The Guardian.
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