Meaning & Definition
adjective
In a state of mental illness or madness.
The patient was deemed insane after a thorough psychological evaluation.
Extremely foolish or irrational; wild.
It was insane to think that he could jump off the roof and land safely.
Incredibly exciting or extreme; extraordinary.
The crowd went insane when the band started playing their hit song.
Etymology
Middle English: from Latin 'insana', from 'in-' meaning 'not' + 'sana' meaning 'healthy'.
Common Phrases and Expressions
insane in the membrane:
Crazy or mentally unstable.
insane asylum:
A place where mentally ill individuals are housed.
driving me insane:
Causing someone to feel extremely frustrated or anxious.
Slang Meanings
Wild or extreme.
That party was insane!
Unbelievable or extraordinary.
The concert was insane; I've never seen anything like it!