re*lent"less*ly
Webster's Dictionary (GCIDE)
Relentless \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. [1913 Webster]
For this the avenging power employs his darts, . . . Thus will persist, relentless in his ire. --Dryden. [1913 Webster] -- Re*lent"less*ly, adv. -- Re*lent"less*ness, n. [1913 Webster]