1) Asinine 2) Blundering 3) Dead 4) Deadened 5) Desensitised 6) Desensitized 7) Dull-witted 8) Gross 9) Imperceptive 10) Inane 11) Insensible 12) Insusceptible 13) Obtuse 14) Ridiculous 15) Simple-minded 16) Slow 17) Stupid 18) Tactless 19) Thick 20) Thick-headed 21) Unfeeling 22) Unreactive 23) Unresponsive 1) Blunt 2) Boorish 3) Callous 4) Crass 5) Cruel 6) Deadened 7) Desensitised 8) Desensitized 9) Heartless 10) Impassive 11) Inconsiderate 12) Indifferent 13) Indiscreet 14) Indurate 15) Insensible 16) Insusceptible 17) Numb 18) Obtuse 19) Selfish 20) Soulless 21) Thick-skinned 22) Tough 23) Unfeeling 
Insensitive refers to a lack of sensitivity. It may also refer to: == See also == ...
• (a.) Not sensitive; wanting sensation, or wanting acute sensibility.
[Adjective] Being unaware of or not caring how other people feel.
In·sen'si·tive adjective Not sensitive; wanting sensation, or wanting acute sensibility. Tillotson. Ruskin. 
[adj] - deficient in human sensibility 2. [adj] - not responsive to physical stimuli
insensitive Deprived of the power of feeling, unconscious; unheeding, unmindful; incapable of feeling.
deficient in human sensibility, acuteness of feeling, or consideration; unfeeling; callous: an insensitive person. · not physically sensitive: insensitive skin. · not affected by physical or chemical agencies or influences: insensitive to light. · not readily responsive or aware: insensitive to the needs of the peasants.