Moderate; of an appropriate or suitable amount/degree—not too much, not too little.
このソースは塩分が程よい。ご飯によく合う。
This sauce has a moderate amount of salt. It goes well with rice.
程よい運動は健康にいい。
Moderate exercise is good for your health.
部屋の明るさが程よくて落ち着ける。
The room's lighting is just right and calming.
Proper; just right—indicating something is suitably timed or fits well.
彼の提案は会議の流れに程よく合っていた。
His proposal fit the flow of the meeting just right.
午後の散歩には程よい気温だ。
It's a just-right temperature for an afternoon walk.
甘さが程よいケーキを探している。
I'm looking for a cake with just the right sweetness.