also: のろ
na-adjective, noun
Describes a person's mind, reaction, or movement as slow or lacking sharpness. Can also refer to objects like knives being blunt. The reading のろ is rarer and more colloquial.
Antonyms: 鋭
彼は頭の回転が鈍い。
He is slow on the uptake.
この包丁は刃が鈍っている。
This kitchen knife has a dull blade.
Kana spelling for the rare reading のろ. Mostly seen in colloquial or emphatic use.
The kanji 鈍 combines the metal radical 金 with 屯, suggesting a blade that has lost its edge. The reading どん is the on'yomi; のろ is a native Japanese reading with uncertain historical derivation.