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