noun
fickle nature; flighty temperament; inconstant person
Describes a person who gets bored easily and doesn't stick with things. Can refer to the trait itself or a person with that trait.
彼は飽き性だから、趣味が長続きしない。
He has a fickle nature, so his hobbies never last long.
私は飽き性で、同じ仕事をずっと
I'm an inconstant person and not good at sticking with the same job.
An i-adjective meaning 'easily bored' or 'fickle'. 飽き性 is a noun describing the trait or person, while 飽きっぽい is an adjective modifying a noun or describing someone's nature.
Compound of 飽き (stem of 飽きる 'to get tired of') and 性 ('nature, disposition').