1) Callously 2) Cruelly 3) Heartlessly 4) Severely 5) Uncaringly 
[adv] - in an unsympathetic manner
unsympathetic, unsympathetically The opposite of sympathetic; without sympathy. Related-word units meaning same: auto-; equ-; homeo-; homo-; iso-; pari-; peer-; tauto-.
without sympathy adverb in an unsympathetic manner; `the judge listened to the accused unsympathetically`