ingenious
You can change the noun "boy" into an adjective by adding a suffix, such as "-ish" to form "boyish," which means characteristic of or resembling a boy.
The noun form of the adjective 'ingenious' is ingeniousness.A related noun is genius, a word for a person.
The abstract noun form of the adjective 'liberal' is liberalness.The word 'genius' is an abstract or concrete noun depending on the context in which it's used.The noun 'genius' is an abstract noun as a word for natural ability or intellect; a word for a concept.The noun 'genius' is a concrete noun as a word for someone who is exceptionally intelligent or creative; a word for a physical person.The noun 'social' is an abstract noun as a word for an informal, friendly gathering; a type of party; a word for a concept.The abstract noun forms of the adjective 'social' are socialism, socialness, and sociability.The abstract noun form of the verb to 'know' is the gerund, knowing.A related abstract noun form is knowledge.
The adjective form is the word "national".
The word 'genius' is a noun, but some dictionaries do list the noun 'genius' as an informal adjective; for example:That was a genius move by the challenger.However, a noun functioning as an adjective is a specific part of speech called an attributive noun (or noun adjunct). There is no consistency among dictionaries for the many nouns that we use as adjectives; some list their use as an adjective and others do not.
The adjective form of the word 'fallacy' is fallacious.
Omnivorous is the adjective form.
The adjective form is axiomatic.
The word 'hungriness' is the noun form of the adjective hungry.The word 'hungry' is the adjective form of the noun 'hunger'.
The adjective form of the word is "Ardent".
The adjective form of dream is dreamy.
The noun form of the adjective 'dangerous' is dangerousness.The word 'dangerous' is the adjective form of the noun danger.The noun form of the adjective 'childish' is childishness.The word 'childish' is the adjective form of the noun child.The noun form of the adjective 'beautiful' is beautifulness.The word 'beautiful' is the adjective form of the noun beauty.