space cadet

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WORDNET DICTIONARY

Noun space cadet has 1 sense

space cadet(n = noun.person) - someone who seems unable to respond appropriately to reality (as if under the influence of some narcotic drug);

CIDE DICTIONARY

space cadet, n.

a person who appears disconnected from reality, or living in his own world; -- sometimes used of people who are under the influence of mind-altering drugs. [PJC]