1) Callous 2) Cruel 3) Heartless 4) Indifferent 5) Indiscreet 6) Insensate 7) Insensitive 8) Insentient 9) Iron-hearted 10) Merciless 11) Numb 12) Stony 13) Stonyhearted 14) Uncompassionate 1) Cold 2) Devoid of feeling 3) Devoid of feeling for others 4) Expressionless 5) Hardhearted 6) Impassive 7) Indifferent 8) Insensible or insensate 9) Insensitive 10) Not feeling 11) Pokerfaced 12) Stonyhearted 13) Uncaring 14) Uncompassionate 15) Unemotional 16) Unsympathetic 
• (a.) Destitute of feeling; void of sensibility; insensible; insensate. • (a.) Without kind feelings; cruel; hard-hearted.
[adj] - devoid of feeling or sensation
adjective devoid of feeling or sensation; `unfeeling trees`
not feeling; devoid of feeling; insensible or insensate. · unsympathetic; callous: an intelligent but unfeeling man.