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