- Unmoved by appeals for sympathy or forgiveness;
insensible to the distresses of others; destitute of tenderness;
unrelenting; unyielding; unpitying; as, a prey to relentless despotism.
Meaning of 'relentless' (Princeton's WordNet)
1 . relentless
[ s]
Meaning (1): - not to be placated or appeased or moved by entreaty
Example in sentence:
grim determination;
grim necessity;
relentless persecution;
Russia's final hour, it seemed, approached with inexorable certainty;