unfeeling \unfeel"ing\, a.
   1. destitute of feeling; void of sensibility; insensible;
      insensate.
      1913 webster

   2. without kind feelings; cruel; hard-hearted.
      1913 webster

            to each his sufferings: all are men,
            condemned alike to groan;
            the tender for another's pain,
            th' unfeeling for his own.            --gray.
      1913 webster -- unfeel"ingly, adv. --
      unfeel"ingness, n.
      1913 webster
see also:
unfeel"ingly unfeel"ingness 

unfeelingly
     adv 1: without compassionate feelings; "unfeelingly, she required
            her maid to work on christmas day" ant: feelingly
     2: in a callous way; "he callously exploited their feelings"
        syn: callously
see also:
feelingly callously