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]