Re·lent·less, a. 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.
For this the avenging power employs his darts, . . .
Thus will persist, relentless in his ire. --Dryden.
-- Re*lent*less*ly, adv. -- Re*lent*less*ness, n.
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relentlessness
n : mercilessness characterized by an unwillingness to relent or
let up; "the relentlessness or their pursuit" [syn: inexorability,
inexorableness]