sharp tool; sharp weapon
Refers to a sharp-edged implement or weapon. Often contrasted with 鈍器 (blunt instrument).
Antonyms: 鈍器
A kitchen knife is a sharp tool for cooking.
Used in the phrase 文明の利器 (conveniences of modern civilization) and similar expressions. Not used as a standalone word for 'convenience'.
See also: 文明の利器
superior talent; outstanding ability
Obsolete. Historically used to refer to a person of exceptional ability, but no longer in modern use.
The suspect is believed to have attacked with a sharp weapon.
Smartphones are a convenience of modern civilization.
In old documents, 利器 can refer to superior talent.
blunt weapon
The exact derivation is uncertain; the kanji 利 (sharp, advantage) and 器 (tool, vessel) combine to mean 'sharp tool' or 'useful implement'.