- informal a person who behaves in a bizarre or eccentric manner
WordReference Random House Learner's Dictionary of American English © 2026
weird•o /ˈwɪrdoʊ/USA pronunciation
n. [countable], pl. -os. [Slang.]
WordReference Random House Unabridged Dictionary of American English © 2026- Informal Termsan odd, strange, or abnormal person.
weird•o
(wēr′dō),USA pronunciation n., pl. weird•os. [Informal.]
- Informal Termsan odd, eccentric, or unconventional person.
- Informal Termsa psychopath, esp. a dangerous or vicious one;
psycho:They caught the weirdo who attacked the children.
- weird + -o 1950–55
Collins Concise English Dictionary © HarperCollins Publishers::
weirdo /ˈwɪədəʊ/, weirdie, weirdy /ˈwɪədɪ/ n ( pl -dos, -dies)
'weirdie' also found in these entries (note: many are not synonyms or translations):