doubtlessly

adv

Etymology: From Middle English doutelesly, dowtelesly, equivalent to doubtless + -ly.

1. Without question; indubitably.

   “There are doubtlessly more insects than mammals.”

2. Without feeling doubt, without misgivings.

   “Some powers diuine, or els infernall, mixt Their angry ſeedes at his conception: For he was neuer ſprong of humaine race, Since with the ſpirit of his fearefull pride, He dares so doubtleſly reſolue of rule.”