神経の鈍い (しんけいのにぶい) Japanese meaning | KotomoraMeanings
1
expression, i-adjective
insensitive; thick-skinned
Describes a person who is emotionally or socially insensitive, not easily affected by others' feelings or criticism. Often used critically.
あんな神経の鈍い発言をするなんて、信じられない。
I can't believe he made such an insensitive comment.