Doubtlessly

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Grammarist

Because doubtless conventionally works as an adverb (in addition to being an adjective) even though it lacks the adverbial -ly ending, the –ly adverb doubtlessly is superfluous. It’s not wrong, but it always bears replacement with a shorter alternative. It addition to doubtless, there is the adverbial phrase no doubt, and there is also the slightly longer undoubtedly, which is more emphatic.

Examples

Doubtlessly is not wrong in these examples, but doubtless would work in its place:

I saw no wildlife, although they doubtlessly saw me. [Guardian]

The threats are doubtlessly hyperbole, but how many of our bosses would put up with them? [USA Today]

Global warming will doubtlessly lead to global warring over resources. [Toronto Star]

And these writers use doubtless as an adverb:

For the younger fans, however, the impression of seeing a real-life prince will doubtless linger longer. [Brisbane Times]

If you asked the men involved, they would doubtless point to sheer graft as the primary catalyst in this transformation. [Independent]

If he makes it to the run-off, he would doubtless find Mr Kuczynski an easier opponent than Mr Toledo. [The Economist]