noun

madness

madness, insanity, craziness, folly

It would be madness to climb the mountain alone.

It would be madness to climb the mountain alone.

He descended into madness after the tragedy.

He descended into madness after the tragedy.

((madness)) the state of being mentally ill The character's descent into madness was terrifying.

((madness)) extremely foolish behavior Driving in this storm is pure madness.

Synonyms: insanity, craziness, lunacy; Antonyms: sanity, reason

From the adjective 'mad' plus the suffix '-ness', which forms nouns indicating a state or condition.

Think of the state of being 'mad'. The '-ness' suffix just turns the adjective into a noun.

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