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ad·a·mant·ly | \ ˈa-də-mənt-lē 
, -ˌmant- \
, -ˌmant- \Definition of adamantly
: in an adamant manner : with great insistence or determination
They adamantly refused to answer any more questions. He adamantly denies the allegations. Although flexible on the subject of research, she adamantly opposes killing animals for food.— Bettyann Kevles
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Time Traveler for adamantly
The first known use of adamantly was in 1897
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