na-adjective
fancy; ornate; decorative
Describes something elaborately decorated, whimsical, or not plain; often used for accessories, stationery, and design.
彼女はファンシーなアクセサリーが好きだ。
She likes fancy accessories.
このノートはファンシーなデザインで人気がある。
This notebook is popular for its fancy design.
noun
Refers to a sudden idea, imaginative thought, or capricious desire; less common than the adjectival use.
それは単なるファンシーに過ぎない。
That's just a whim.
彼の頭の中はファンシーでいっぱいだ。
His head is full of fancies.