Question

what is abstract noun of false

Answer 1

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Here is your answer
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An abstract noun is something that denotes a quality. 

It is the opposite of concrete noun.

The abstract noun of false is falseness.
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Answer 2

Abstract noun denotes the state, quality or an idea or an event.

Eg:-Anxiety,Being,Anger,Beauty,Charity etc.

The abstract noun of false is Falseness.