堅けん強きょう

na-adjective, noun

robust; strong; tough

Describes something physically or structurally sturdy, resilient, and able to withstand pressure or hardship. Often used for materials, systems, or abstract qualities like willpower.

• この素そ材ざいは非ひ常じょうに堅けん強きょうで、長ちょう期き間かんの使し用ように耐たえられる。

  This material is extremely robust and can withstand long-term use.

• 彼かれの堅けん強きょうな意い志しがチームを支ささえた。

  His strong will supported the team.