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Adverb: doubtlessly  dawt-lus-lee
  1. Without doubt; certainly
    "it's doubtlessly very beautiful";
    - undoubtedly, doubtless

Nearest

doubly transitive verb form
doubt
doubtable
doubter
doubtful
doubtfully
doubtfulness
doubting
doubting Thomas
doubtless
doubtlessly
douce
douceur
douche
douche bag
dough
doughboy
doughnut
doughnut-shaped
doughtily
doughty