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space cadet

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noun Slang.
  1. a person who appears to be in his or her own world or out of touch with reality.
  2. a person who behaves oddly or seems stupefied or remote because of the influence of drugs; druggie.
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Origin of space cadet

1950–55, for sense “spaceman trainee”
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for space cadet

junkie, addict, user, absent, absorbed, abstracted, careless, distracted, dreaming, dreamy, engrossed, faraway, forgetful, heedless, inattentive, lost, oblivious, preoccupied, remote, removed
British Dictionary definitions for space cadet

space cadet

noun
  1. slang a person who is eccentric or out of touch with reality, as if affected by drugs
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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