Na-adjective (keiyodoshi), Nounthickheaded; insensitive; dull; thick-skinned

Noun, Na-adjective (keiyodoshi)blockhead; dunce; dimwit; dolt; slowcoach; slowpoke

I-adjective (keiyoushi)dull (e.g. a knife); blunt · thickheaded; obtuse; stupid · dull (sound, color, etc.); dim (light)

I-adjective (keiyoushi)thickheaded; obtuse; stupid · slow; sluggish; inert; lethargic · indulgent (esp. to the opposite sex); doting

Noun, Suru verb, Intransitive verbbecoming dull; slowing down