insensitive
in-sen-si-tive
adjective
Lacking consideration or empathy for the feelings of others.
"His insensitive comments upset everyone."
adjective
Not responsive or reactive to a particular stimulus or influence.
"The plant was insensitive to changes in light."
Thesaurus
Synonyms: unaffected, soulless, callous, numb, dull, dead, pachydermatous, thick-skinned, tough-skinned, indurate, insensible, unreactive
Antonyms: sensitive