noun
mercilessness characterized by an unwillingness to relent or let up
-
the relentlessness or their pursuit
• Syn: ↑relentlessness, ↑inexorability
• Derivationally related forms: ↑inexorable, ↑inexorable (for: ↑inexorability), ↑relentless (for: ↑relentlessness)
• Hypernyms: ↑mercilessness, ↑unmercifulness
Useful english dictionary. 2012.