堅い

Etymology
This word was derived from ancient Japanese origin and applied the meaning of Chinese letter  that means keeping its physical shape or behavior by its excellent quality.

In turn, from kata, from.

Adjective

 * 1) firm, resolute
 * 2) honest, steadfast
 * 3) stern, strict, serious
 * 4) safe
 * 5) indestructible, unwreckable
 * 1) safe
 * 2) indestructible, unwreckable
 * 1) indestructible, unwreckable
 * 1) indestructible, unwreckable