very well, carefully, thoroughly
昔は皆それをよーく知っておった
Back then, everyone knew that very well.
— 天気の子 (2019)
よーく聞いてください。
Please listen carefully.
あなたがこの町に来た日のことをよーく覚えてますよ
I remember the day you came to this town like it was yesterday.
— 魔女の宅急便 (1989)
よーく息子さんと相談してねっ
Make sure you talk it over carefully with your son, okay?
— 万引き家族 (2018)