苦く無ない

noun

ninja throwing knife; kunai

Colloquial term for the iconic ninja tool; often depicted as a multi-purpose dagger used for throwing, climbing, or digging.

• 忍にん者じゃは壁かべを登のぼるために苦く無ないを使つかった。

  The ninja used a kunai to climb the wall.

noun

medieval farming tool; digging tool; prying tool

Original meaning; a simple iron tool used in agriculture and construction during the medieval period, later adapted as a ninja weapon.

• 中ちゅう世せいの農のう民みんは苦く無ないを土つちを掘ほるのに使つかっていた。

  Medieval farmers used the kunai for digging soil.