undoubtedly
un-DOWT-id-lee/ʌnˈdaʊtɪdli/
- 1Without any doubt; in a way that is certain and beyond question.
The discovery undoubtedly changed how researchers understood the disease.
His sharp remarks were undoubtedly meant to provoke a reaction from the panel.
Similarcertainly, surely, definitely, unquestionably, doubtless
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Origin
From Middle English undoutedly, equivalent to undoubted plus the suffix -ly.