from Wiktionary, Creative Commons Attribution/Share-Alike License
- adv. In a speechless manner; without speaking.
from The Century Dictionary and Cyclopedia
- Without speaking; so as to be incapable of utterance: as, speechlessly amazed.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adv. without speaking
speechless + -ly (Wiktionary)