Insensitive
Thickheaded, Obtuse
な adjective, noun
どんかん
鈍い (にぶい、のろい) Dull, Thickheaded
鈍感 (どんかん) Insensitive, Thickheaded, Obtuse
偏狭 (へんきょう) Narrow Minded, Intolerance
Don どん can かん teach you all about Thickheadedness.