unremorseless

Etymology
( functions as an intensifier)

Adjective

 * 1)  Utterly remorseless.
 * 2) * 1836-40,, The Clockmaker
 * We are not free; we are slaves: one half of us is tyrants,—unremorseless, onfeelin', overbearin' tyrants, and vile usurpers; and the other half slaves
 * We are not free; we are slaves: one half of us is tyrants,—unremorseless, onfeelin', overbearin' tyrants, and vile usurpers; and the other half slaves