from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Lacking strong emotion or feeling: a rather passionless plea for clemency.
- adj. Unbiased or impartial; detached: a newspaper's passionless account of a sensational trial.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Lacking in passion.
from the GNU version of the Collaborative International Dictionary of English
- adj. Void of passion; without anger or emotion; not easily excited; calm.
from The Century Dictionary and Cyclopedia
- Void of passion; not easily excited to anger; of a calm temper.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. not passionate
- adj. unmoved by feeling
passion + -less (Wiktionary)