鈍(にぶ)いdull (e.g. a knife), blunt, thickheaded, obtuse, stupid, dull (sound, color, etc.), dim (light), slow, sluggish, inert, lethargic, indulgent (esp. to the opposite sex), doting

ナマケモノの動作(どうさ)はとても鈍(にぶ)いです。

The sloth's movements are very slow. {dull (e.g. a knife), blunt, thickheaded, obtuse, stupid, dull (sound, color, etc.), dim (light), slow, sluggish, inert, lethargic, indulgent (esp. to the opposite sex), doting}

運動(うんどう)神経(しんけい)が鈍(にぶ)いので、よく転(ころ)んでしまう。

Since I have poor motor skills, I often end up falling. {dull (e.g. a knife), blunt, thickheaded, obtuse, stupid, dull (sound, color, etc.), dim (light), slow, sluggish, inert, lethargic, indulgent (esp. to the opposite sex), doting}

ナイフの切(き)れが鈍(にぶ)かったので、ナイフを研(と)ぎました。

The knife was dull, so I sharpened it. {dull (e.g. a knife), blunt, thickheaded, obtuse, stupid, dull (sound, color, etc.), dim (light), slow, sluggish, inert, lethargic, indulgent (esp. to the opposite sex), doting}

リモコンへの反応(はんのう)が鈍(にぶ)いテレビがあまり売(う)れないのも当然(とうぜん)です。

It's only natural that TVs that respond slowly to the remote control don't sell very well. {dull (e.g. a knife), blunt, thickheaded, obtuse, stupid, dull (sound, color, etc.), dim (light), slow, sluggish, inert, lethargic, indulgent (esp. to the opposite sex), doting}

ドスンという鈍(にぶ)い音(おと)からして、何(なに)か大(おお)きなものが倒(たお)れたに違(ちが)いありません。

Judging from the dull thud, something big must have fallen. {dull (e.g. a knife), blunt, thickheaded, obtuse, stupid, dull (sound, color, etc.), dim (light), slow, sluggish, inert, lethargic, indulgent (esp. to the opposite sex), doting}