Dictionary / Vocabulary / 苦
く
pain; anguish; suffering; distress
彼は長時間働いても苦にならなかった。
He made nothing of working for a long time.
彼は早起きが苦にならない。
He makes nothing of getting up early in the morning.
楽は苦の種苦は楽の種。
One cannot have pain without pleasure, and one cannot have pleasure without pain.