from Wiktionary, Creative Commons Attribution/Share-Alike License
- adv. In a manner that leaves no possibility of doubt; undoubtedly.
from the GNU version of the Collaborative International Dictionary of English
- adv. Undoubtedly; unquestionably; in a manner to remove all doubt.
from The Century Dictionary and Cyclopedia
- In an indubitable manner; unquestionably; without or beyond doubt; evidently.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adv. in a manner or to a degree that could not be doubted
indubitable + -ly (Wiktionary)