from Wiktionary, Creative Commons Attribution/Share-Alike License
- adv. Without question; indubitably.
from the GNU version of the Collaborative International Dictionary of English
- adv. Unquestionably.
from The Century Dictionary and Cyclopedia
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adv. without doubt; certainly
doubtless + -ly (Wiktionary)