wack synonym, wack definition | Thesaurus
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wacky  

   
crazy, daft     (informal)   eccentric, erratic, gonzo     (slang)   goofy     (informal)   irrational, loony     (slang)   nutty     (slang)   odd, oddball     (informal)   off-the-wall     (slang)   outré, screwy     (informal)   silly, unpredictable, wacko or whacko     (informal)   wild, zany  
English Collins Dictionary - English synonyms & Thesaurus  
Collins
wacko     
If you say that someone is wacko, you are saying in an unkind way that they are strange and eccentric.  
INFORMAL      adj  
  (disapproval)    (=mad)  
Lampley was obviously completely wacko.     

Translation English - Cobuild Collins Dictionary  

See also:

whack, wake, walk, weak

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"Collins Cobuild English Dictionary for Advanced Learners 4th edition published in 2003 © HarperCollins Publishers 1987, 1995, 2001, 2003 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"