気長

返事が来るまで気長に待つことにした。

I decided to wait patiently until I heard back.

語学の勉強は気長に続けるのが一番だ。

With language study, it's best to keep at it patiently.

祖父は気長な性格で、めったに怒らない。

My grandfather has a patient temperament and rarely gets angry.