Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adv. Certainly: The wind was doubtless a factor.
  • adv. Presumably; probably: as you doubtless already know.
  • adj. Certain; assured.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Characterized by or experiencing no doubt at all, certain; undoubted; undoubting.
  • adv. Without doubt; very probably, in all likelihood; doubtlessly.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Free from fear or suspicion.
  • adv. Undoubtedly; without doubt.

from The Century Dictionary and Cyclopedia

  • Free from doubt; indubitable.
  • Having no fear; free from fear of danger; secure.
  • Without doubt; without objection or uncertainty; unquestionably; often, with weakened sense, presumably, probably.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adv. without doubt; certainly

Etymologies

From doubt +‎ -less. (Wiktionary)

Examples

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