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
wacky ( wackier comparative) ( wackiest superlative ) , whacky If you describe something or someone as wacky, you mean that they are eccentric, unusual, and often funny.
...a wacky new television comedy series...
Translation English - Cobuild Collins Dictionary
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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"