Dull or blunt (e.g., a knife); lacking sharpness or edge.
包丁が鈍くて野菜がうまく切れない。
The kitchen knife is dull and can't cut vegetables well.
寒さでナイフの刃が鈍くなっているようだ。
It seems the knife's edge has become dull from the cold.
Thick-headed; obtuse; slow to understand or respond — not quick-witted.
彼は冗談が通じないほど鈍いところがある。
He can be so slow that he doesn't get jokes.
説明しても鈍いので、もう一度やさしく教えた。
He was slow to get it, so I explained it more gently once again.
運転のコツがわかるまで少し鈍かったが、すぐ慣れた。
He was a bit slow to pick up driving skills at first, but he got used to it quickly.
Dull (sound, color, etc.); muted or dim — not bright or sharp.
鈍い色合いの絵画が部屋に落ち着いた雰囲気を与える。
A painting with muted colors gives the room a calm atmosphere.
鈍い音が遠くから聞こえてきた。
A dull sound could be heard from afar.
Slow; sluggish; lethargic — moving or responding slowly, lacking energy.
鈍い天気のせいで体がだるく、動きが鈍い。
The sluggish weather makes my body feel heavy and slow to move.
朝は頭が鈍くて、すぐに仕事に集中できないことが多い。
In the morning my head is sluggish, and I often can't concentrate on work immediately.
Insensitive; slow to perceive — lacking quick perception or feeling; unperceptive or unfeeling.
その批判に対して彼は鈍く、気にしている様子はなかった。
He was unaffected by the criticism and didn't seem to care.
足の痛みに対して反応が鈍く、病院に行くのが遅れた。
His reaction to the foot pain was slow, and he delayed going to the hospital.