Synonym: crazy, deranged, foolish, mad, unbalanced. Antonym: sane. Similar words: insatiable, instantaneous, on sale, sand, sank, compensate, sensation, cane. Meaning: [ɪn'seɪn] 
adj. 1. afflicted with or characteristic of mental derangement 2. very foolish.
adj. 1. afflicted with or characteristic of mental derangement 2. very foolish. 
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1. An insane person is unaccountable for his actions.
2. Are you insane crazy out of your mind?
3. Grief drove her insane.
4. Only an insane person could perpetrate such a horrible crime.
5. He later became insane and was confined to an asylum.
6. That's an insane risk.
7. The whole idea sounds absolutely insane to me.
8. You're driving me nearly insane with that noise.
9. The accused has been certified insane/certified to be insane.
10. The whole idea is quite insane.
11. The doctor certified him insane.
12. Insane people are sometimes dangerous.
13. The prisoners were slowly going insane.
14. They believed him to be insane.
15. My little brother's been driving me insane all weekend.
16. It seems insane to cut the budget now.
17. This job is driving me insane.
18. The killer was declared criminally insane.
19. The psychiatrist certified her as insane.
20. In a fit of insane jealousy he tried to stab her.
21. He went almost insane when he heard that his daughter had died.
22. He must be insane to drive his car so fast.
23. I must have been insane to agree to the idea.
24. He was declared insane and ordered to be detained in a mental hospital at Her Majesty's pleasure.
25. My desire to be rich was an insane, unwholesome,(sentencedict.com) oppressive desire.
26. In 1975 she was certified clinically insane and sent to a mental hospital.
27. For the last ten years of his life he was clinically insane.
28. And those who were seen dancing were thought to be insane by those who could not hear the music. Friedrich Nietzsche 
29. Some people simply can't take it and they just go insane.
30. He believes that too many defendants are escaping conviction by claiming that they are insane.
More similar words: insatiable, instantaneous, on sale, sand, sank, compensate, sensation, cane, compensation, transaction, unsatisfied, commensalism, compensate for, dispensable, sandwich, sand dune, peasant, bane, lane, dispensation, condensation, sanguine, sandstorm, incessant, pleasant, chitosan, partisan, sanction, inane, panel.