undoubtedly
un-DOWT-id-lee/ʌnˈdaʊtɪdli/
- 1Used to show that something is certainly true and cannot be doubted.
She is undoubtedly the best player on the team.
The new road will undoubtedly help reduce traffic in town.
Similarcertainly, surely, definitely, unquestionably, doubtless
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Origin
From Middle English undoutedly. It comes from undoubted plus -ly.