What is an abstract noun false?

Hint: A noun that cannot be perceived using either of the five senses is called an abstract noun (i.e., taste, touch, sight, hearing, smelling). Take a look at the following examples: It takes a lot of courage to do a talk like that. Since the noun, ‘courage’ is something that a person has but cannot be seen, heard, tasted, touched, or smelled, it is an abstract noun.

Complete answer:
Nouns can be broadly divided into two types; Concrete Nouns and Abstract Nouns.
Concrete nouns refer to physical things which can be seen, touched or heard etc. For e.g. rocks, books, tables, chairs etc.

On the other hand, abstract nouns refer to abstract things, such as ideas or concepts (such as justice or hatred). Although this distinction isn't always absolute, some nouns have several meanings, including concrete and abstract ones: for example, the noun art, which typically refers to a concept but may also refer to a particular artwork in some circumstances.

Some abstract nouns are etymologically formed from literal origins by figurative extension. The drawback, fraction, holdout, and uptake are examples of these. Similarly, certain nouns have both abstract and concrete meanings, with the latter arising from the former by figurative extension. View, filter, structure, and key are some of them.

Therefore, FALSENESS is the abstract noun for the adjective 'false’.

Note: Many abstract nouns in English are created by adding the suffixes -ness, -ity, or -ion to adjectives or verbs. ‘Happiness’ comes from the adjective ‘happy’, ‘circulation’ comes from the verb ‘circulate’, and ‘serenity’ comes from the adjective ‘serene’, to name a few.