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US
/ʌnˈdaʊtəbli/
UK
/ʌnˈdaʊtəbli/
See IPA manual
From un- ('not') + doubtable (doubt + -able) + -ly; a variant of undoubtedly. Doubt is from Old French douter, from Latin dubitare ('to waver, hesitate'), from dubius ('doubtful').
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