na-adjective, noun
fickle; capricious; changeable
Describes a person or their feelings that shift easily; often used for romantic interest or hobbies. The noun form can refer to such a personality trait.
彼は移り気で、すぐに別の趣味に夢中になる。
He is fickle and quickly gets absorbed in another hobby.
移り気な性格のせいで、
Because of my capricious nature, I can't stick with anything for long.