noun

hollowness

hollowness, emptiness, insincerity

He felt a hollowness in his stomach.

He felt a hollowness in his stomach.

The hollowness of her promises was clear.

The hollowness of her promises was clear.

the hollowness of ((sth.)) the hollowness of (sth.) The hollowness of his words was sad.

Synonyms: emptiness, void, vacuity, insincerity; Antonyms: fullness, solidity, sincerity

From the adjective 'hollow' plus the noun-forming suffix '-ness'.

It's the state of being 'hollow'. If you feel 'hollow', you are feeling 'hollowness'.

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