from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The condition of being relentless.
from The Century Dictionary and Cyclopedia
- n. The quality of being relentless, or unmoved by pity.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. mercilessness characterized by an unwillingness to relent or let up
relentless + -ness (Wiktionary)