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weirdo

[weer-doh]
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noun, plural weird·os. Informal.
  1. an odd, eccentric, or unconventional person.
  2. a psychopath, especially a dangerous or vicious one; psycho: They caught the weirdo who attacked the children.
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Origin of weirdo

First recorded in 1950–55; weird + -o
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for weirdo

weirdo

weirdie (ˈwɪədɪ)

noun plural -dos or -dies
  1. informal a person who behaves in a bizarre or eccentric manner
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for weirdo

n.

"strange person," 1955, from weird. Cf. earlier Scot. weirdie (1894).

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Online Etymology Dictionary, © 2010 Douglas Harper