Also means
without a doubt
Usage Note
zweifellos asserts certainty, literally doubt-less. It conveys the speaker sees no room for disagreement: Das ist zweifellos die beste Lösung. More emphatic and formal than sicher.
Examples
"Er ist zweifellos der beste Spieler im Team."
Natural Translation
He is undoubtedly the best player on the team.
Literal Translation
He is doubtless the best player in-the team.

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