думать

Inherited from Proto-Slavic *dumati, origin disputed. Either a loan from Proto-Germanic *dōmijaną (“to judge, think”) (whence English deem) either as a direct loan or ultimately from Proto-Indo-European *dʰewh₂- (“to smoke”), akin to Proto-Slavic *duti (“to blow, to inflate”), *dymъ (“smoke”). For the latter compare θῡμός (thūmós, “soul, emotion”), occasionally also “thought, mind”. Also compare надме́нный (nadménnyj, “supercilious, haughty, arrogant”) as another meaning change to a mental characteristic from the same root.(Can this⁽⁺⁾ etymology be sourced?)

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ду́мать • (dúmatʹ) impf (perfective поду́мать, verbal noun ду́мание)

1. to think

   Synonym: мы́слить (mýslitʹ)

2. to believe, to suppose

   Synonyms: счита́ть (sčitátʹ), мни́ть (mnítʹ)

intransitive:

transitive:

intransitive:

transitive:

• вы́думка (výdumka), вы́думщик (výdumščik), ду́ма (dúma), ду́мка (dúmka), обду́мывание (obdúmyvanije), приду́мка (pridúmka), разду́мье (razdúmʹje)
• безду́мный (bezdúmnyj), вду́мчивый (vdúmčivyj), наду́манный (nadúmannyj)

• → Ingrian: duumata

• Vasmer, Max (1964–1973) “думать”, in Oleg Trubachyov, transl., Этимологический словарь русского языка [Etymological Dictionary of the Russian Language] (in Russian), Moscow: Progress
• Vasmer, Max (1964–1973) “ду́ма”, in Oleg Trubachyov, transl., Этимологический словарь русского языка [Etymological Dictionary of the Russian Language] (in Russian), Moscow: Progress