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Insane One's Insane  Adjective From  Words Dictionary An 

Title insane
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Merriam-Webster's Collegiate Dictionary
in·sane

 \\(ˌ)in-ˈsān\\ adjective
 ETYMOLOGY  Latin insanus, from in- + sanus sane
 DATE  circa 1550
1. mentally disordered : exhibiting insanity
2. used by, typical of, or intended for insane persons
    an insane asylum
3. 
absurd
    an insane scheme for making money
4. 
extreme
 1
• in·sane·ly adverb
• in·sane·ness 
 \\-ˈsān-nəs\\ noun
English Etymology
insane
  1560, from L. insanus "mad, insane, outrageous, excessive, extravagant," from in- "not" + sanus (see sane). Originally only of persons; of actions, from 1842. Cf. lunatic; and It. pazzo "insane," originally a euphemism, from L. patiens "suffering." Ger. verrücktlit. pp. of verrücken "to displace," "applied to the brain as to a clock that is 'out of order' " [Buck].
Oxford Advanced Learner's Dictionary-牛津双解-OALD7
insane
in·sane in5sein / adjective1. seriously mentally ill and unable to live in normal society
   精神失常的;精神错乱的:
   Doctors certified him as insane. 
   医生证明他精神失常。 
   The prisoners were slowly going insane.
   囚犯正慢慢地变得精神错乱起来。 
   OPP  
sane
 
 note at 
mental
 
2. the insane noun [pl.] people who are insane 
   精神失常的人;精神错乱的人:
   a hospital for the insane 
   精神病院 
3. (informal) very stupid, crazy or dangerous
   十分愚蠢的;疯狂的;危险的:
   I must have been insane to agree to the idea. 
   我肯定是犯傻了,居然同意了这个想法。 
   This job is driving me insane (= making me feel very angry).
   这份工作快要把我逼疯了。 
 see also 
insanity
 
 in·sane·ly adv.:
   He is insanely jealous. 
   他嫉妒得发疯。 
Oxford Collocations Dictionary for Students of English
Oxford Collocations dictionary for students of English


insane 
adj. 
mentally ill/crazy 

VERBS be, look | become, go He later became insane and was confined to an asylum. He went almost insane when he heard that his daughter had died. | drive sb You're driving me nearly insane with that noise. | certify sb, declare sb In 1975 she was certified clinically insane and sent to a mental hospital. 

ADV. completely, totally | almost, nearly | a little | dangerously | clinically | criminally He is criminally insane, unable to stop himself attacking women. 

very stupid/dangerous 

VERBS be, seem It seems insane to cut the budget now. 

ADV. quite, totally The whole idea is quite insane. 

Merriam-Webster's Collegiate Thesaurus-11th Edition
adj. Function: adjective 

1 being afflicted by or manifesting unsoundness of mind or an inability to control one's rational processes FF1C;adjudged insaneafter a period of observationFF1E; 
Synonyms: bananas, ||batty, bedlamite, ||bonkers, brainsick, ||buggy, ||bughouse, ||bugs, crackbrained, cracked, ||crackers, ||cracky, ||cranky, crazed, crazy, cuckoo, daffy, daft, demented, deranged, disordered, distraugh, ||fruity, ||loco, looney, lunatic, mad, maniac, ||mental, mindless, non compos mentis, nuts, nutsy, nutty, reasonless, screwy, teched, unbalanced, unsane, unsound, wacky, witless, wrong 
Related Words: irrational, unreasonable; bewildered, distracted; dotty, eccentric, off, rocky, strange, touched; ||dippy 
Idioms: around the bend, crazy as a coot, not all there, not right in one's head, ||off one's dot, off one's nut (or rocker), ||off one's onion, out of (or off) one's head, out of one's mind, touched in the head 
Contrasted Words: judicious, sapient, sensible, wise; rational, reasonable; balanced; logical, subtle; healthy, sound; clear, lucid 
Antonyms: sane 
2 
Synonyms: 
FOOLISH
 2, absurd, ||balmy, crazy, harebrained, loony, ||potty, preposterous, silly, wacky 
Related Words: fanciful, fantastic, imaginary, visionary; impractical, unrealistic 
Contrasted Words: feasible, possible, practicable, usable; rational, reasonable, sane, sensible; practical, realistic
Webster's Third New International Dictionary, Unabridged
Search result show the entry is found in: insane root

in·sane
\(ˈ)in|sān, ənˈs-\ adjective
(sometimes -er/-est)
Etymology: Latin insanus, from in- in- (I) + sanus sane
1. 
 a. obsoleteof the mind : 
unsound
disordered
 b. of a person : exhibiting unsoundness or disorder of mind :affected with insanity : 
mad
especially : disordered in mind to such a degree as to be unable to function safely and competently in ordinary human relations — compare 
psychotic
2. obsolete : causing insanity
3. : used by, typical of, or for insane persons
 < an insane hospital >
 insane ravings >
4. : utterly foolish or ridiculous : lacking any logical or practical basis : wildly visionary
 < a perfectly insane idea >
 < such insane extravagance >
 < the insanest thing you ever saw >
• in·sane·ness \-ānnə̇s\ noun

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