noun
eccentric, crackpot*, oddball*, loony*, cuckoo*, ding-a-ling*, nut*, screwball*, crazy*, weirdo*, wacko*, flake*, fruitcake*, nutcase*, dingbat*, harebrain*, lamebrain*; see also character 4.
See kook in Webster's New World Roget's A-Z Thesaurus II
A person regarded as strange, eccentric, or crazy:
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» eccentric
» kooky
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