from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Lacking expression: Their faces remained expressionless as they listened to the bad news.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. without expression
from the GNU version of the Collaborative International Dictionary of English
- adj. Destitute of expression.
from The Century Dictionary and Cyclopedia
- Destitute of expression.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. deliberately impassive in manner
expression + -less (Wiktionary)