The word 'infant' is not an adjective; the word 'infant' is a noun, a concrete noun, a word for a person (a very young person).
The abstract noun form of the concrete noun 'infant' is infancy, a word for a period in a person's life.
The word 'infant' is both an adjective and a noun, a concrete noun as a word for a physical person.The abstract noun form of the concrete noun 'infant' is infancy, a word for a period in a person's life.
The abstract noun form of the concrete noun 'thief' is thievery.The abstract noun form of the concrete noun 'infant' is infancy.The abstract noun form of the concrete noun 'coward' is cowardice.The abstract noun form of the adjective 'urgent' is urgency.
The abstract noun form of the concrete noun 'infant' is infancy.
The abstract noun form of the adjective 'indifferent' is indifference.
The abstract noun is infancy.
The abstract noun form of the adjective unique is uniqueness.
The abstract noun form for the adjective truthful is truthfulness.The word 'truthful' is the adjective form of the abstract noun truth.
The abstract noun form of the adjective 'famous' is famousness.The word 'famous' is the adjective form of the abstract noun fame.
The abstract noun of the adjective "blue" is "blueness."
The abstract noun for the adjective quick is quickness.
The abstract noun of the adjective "shy" is "shyness."
The abstract noun form of the adjective triumphant is triumph.