doubtful

1. Subject to, or causing doubt.

   zweifelhaft

   сомни́тельныйsomnítelʹnyj

   fraught with uncertainty or doubt

2. Experiencing or showing doubt, skeptical.

   zweifelnd

   сомнева́ющийсяsomnevájuščijsja

   open to doubt or suspicion

3. Undecided or of uncertain outcome.

   zweifelhaft

   сомни́тельныйsomnítelʹnyj

4. Improbable or unlikely.

   zweifelhaft

   сомни́тельныйsomnítelʹnyj

5. Suspicious, or of dubious character.

   zweifelhaft

6. Unclear or unreliable.

7. (obsolete)Fearsome, dreadful.

1. I'm doubtful whether Tom will come.

   Я сумніваюсь, що Том прийде. — oromashka

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2. I am doubtful whether he will come.

   Я сумніваюся, що він прийде. — aandrusiak

   ruЯ сомневаюсь, что он придет. — sharptoothed

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3. Tom is doubtful.

   Том сумнівається. — deniko

   deTom ist unschlüssig. — Felixjp

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4. I am doubtful of his success.

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5. It's doubtful whether Tom will come.

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regular