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From think +‎ -o, on the model of typo (typographical error).


  • IPA(key): /θɪŋkəʊ/
  • (file)
  • Rhymes: -ɪŋkəʊ


thinko (plural thinkos)

  1. (slang) A careless mistake made in thinking.
    I must have done quite a thinko, but I don't remember leaving my keys in the refrigerator.
    • 1998, K. G. Binmore, Game Theory and the Social Contract, Volume 2: Just Playing, page 34,
      We need to face the fact that thinkos are likely to be much more important, even though such a source of noise is much harder to model.
    • 2006, Kristen B. Donohue, “Misused Words and Other Witing Gaffes: A Manager's Primer”, in Written Communications that Inform and Influence, Harvard Business School, page 164:
      Spell-checkers can help with simple types such as misspeIIings and repeated words, but they are little defense against the equally common "thinkos," such as the inconvenience/incontinence example above. Your only defense against thinkos is a careful read.
    • 2008, Kurt Wall, Tcl and Tk Programming for the Absolute Beginner[1], page 134:
      I don't know about you, but I don't want to grovel through a bunch of code blocks to track down a typo or thinko.
    • 2009, Geoff Nunberg, Going Nucular: Language, Politics, and Culture in Confrontational Times[2], page 59:
      There are two kinds of linguistic missteps, the typos and the thinkos. Typos are the processing glitches that intercede between a thought and its expression. They can make you look foolish, but they aren't really the signs of an intellectual or ethical deficiency, the way thinkos are.


Coordinate terms[edit]


thinko (third-person singular simple present thinkos, present participle thinkoing, simple past and past participle thinkoed or thinko'd)

  1. To make a mistake when thinking.