insensitive

1. Not responsive to physical stimuli (synset 302112655)
   "insensitive to radiation"
   also:

   • unresponsive - not responding to some influence or stimulus
   • insensible - incapable of physical sensation
   • insusceptible, unsusceptible - not susceptible to
   tells us about: sensitiveness, sensitivity - the ability to respond to physical stimuli or to register small physical amounts or differences
   similar to:

   • dead, deadened - devoid of physical sensation; numb
   • unreactive - not tending to react to stimulation
2. Deficient in human sensibility;
   Not mentally or morally sensitive (synset 302114041)
   "insensitive to the needs of the patients"
   also:

   • hard - dispassionate
   • unresponsive - not responding to some influence or stimulus
   • insensible - incapable of physical sensation
   • tough - not given to gentleness or sentimentality
   tells us about: sensitiveness, sensitivity - sensitivity to emotional feelings (of self and others)
   similar to:

   • callous, indurate, pachydermatous - emotionally hardened
   • dead, numb - (followed by `to') not showing human feeling or sensitivity; unresponsive
   • dull - blunted in responsiveness or sensibility
   • insensible, unaffected - unaware of or indifferent to
   • soulless - lacking sensitivity or the capacity for deep feeling
   • thick-skinned, tough-skinned - insensitive to criticism

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