fickle nature; flighty temperament; inconstant person
彼は飽きしょうな性格で有名です。
He is known for his fickle nature.
飽きしょうなので長続きしません。
Because of his flighty temperament, he doesn't last long.
飽きしょうな彼は新しい趣味を探しています。
The fickle him is looking for new hobbies.