English version

space cadet

From Longman Dictionary of Contemporary Englishspace cadetˈspace caˌdet noun [countable]  informalSTUPID/NOT SENSIBLE someone who forgets things, does not pay attention, and often behaves strangely
Examples from the Corpus
space cadetWas it because she is a mixed-up, self-centred space cadet?Jimmy's a total space cadet.
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