<adv.all> unfeelingly, she required her maid to work on Christmas Day
in a callous way
<adv.all> he callously exploited their feelings
Unfeeling \Un*feel"ing\, a. 1. Destitute of feeling; void of sensibility; insensible; insensate.
2. Without kind feelings; cruel; hard-hearted.
To each his sufferings: all are men, Condemned alike to groan; The tender for another's pain, Th' unfeeling for his own. --Gray. ※ -- {Un*feel"ing*ly}, adv. -- {Un*feel"ing*ness}, n.