鈍い【にぶい】
dull (e.g. a knife), blunt, thickheaded, obtuse, stupid, dull (sound, color, etc.), dim (light), slow, sluggish, inert, lethargic, insensitive, dull (e.g. reflexes), unperceptive, unfeeling
鈍い【のろい】
thickheaded, obtuse, stupid, slow, sluggish, inert, lethargic, indulgent (esp. to the opposite sex), doting
鈍感【どんかん】
thickheaded, insensitive, dull, thick-skinned
鈍る【にぶる】
to become blunt, to grow dull, to become less capable, to weaken, to falter
鈍器【どんき】
blunt weapon
鈍化【どんか】
becoming dull, slowing down
鈍らす【にぶらす】
to blunt, to dull, to weaken
鈍行【どんこう】
local train, slow train