expression, i-adjective
Describes a person who is emotionally or socially insensitive, not easily affected by others' feelings or criticism. Often used critically.
彼は神経の鈍い人だから、嫌味を言っても気づかない。
He's so thick-skinned that he doesn't even notice when someone makes a snide remark.
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.
無神経 is a stronger term meaning 'insensitive' or 'thoughtless', often implying a lack of consideration for others. 神経の鈍い is slightly milder and more about being slow to perceive.
A phrase composed of 神経 (nerves, sensitivity) + の (possessive particle) + 鈍い (dull, slow). Literally 'dull of nerves', it figuratively describes emotional or social insensitivity.