Definition of doubtlessly in English:

doubtlessly

adverb

  • 1Certainly; without doubt.

    ‘the man's reputation doubtlessly preceded him’
    ‘he is doubtlessly guilty’
    1. 1.1 Presumably or very probably.
      ‘you've doubtlessly heard me ramble on about the importance of culture’
      ‘we've doubtlessly got names in the wrong order’

Pronunciation

doubtlessly

/ˈdaʊtləsli/