What are synonyms of insanity?

Aberration.

Absurdity.

Alienation.

Craziness.

Delirium.

Delusion.

Dementia.

Derangement.

Frenzy.

Hysteria.

Irrationality.

Lunacy.

Madness.

Mania.

Mental.

Preposterousness.

Psychopathy.

Psychosis.

Senselessness.

Unbalance(ed).