Russian

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Etymology

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From на (na) +‎ обу́м (obúm, in vain, at random), further from об (ob) + ум (um, mind).

Pronunciation

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Adverb

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наобу́м (naobúm)

  1. (colloquial) at random, randomly, blindly, haphazardly (without preliminary consideration of how something will turn out; without thinking)
    Synonyms: науга́д (naugád), науда́чу (naudáču)