健やか

すこやか · sukoyaka · JLPT N1 · na-adj

vigorous; healthy; sound

健 (healthy, strong) + -やか (having the quality of) = vigorous, sound

健 is the kanji for health and strength, the same root as 健康 (kenkou, health). The -やか ending turns it into a state adjective, like 穏やか (calm).

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