la duda (noun)

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  1. doubt, uncertainty
  2. question (as in “sin duda” – without a doubt, or asking questions in class)

Prefiero la cerveza clara a la negra, sin .

I prefer light beer to dark, no doubt about it.

Están teniendo sobre el plan.

They're having doubts about the plan.

Eran otros tiempos, sin .

Those were different times, no doubt.