What's the correct word to describe them?
If someone get tired of things easily, (lover, stuff, hobby, dress etc.)

What's the correct word to describe them?

She is whimsical.
She is fickle.
She is whimsy.
She is whimsey.
She is desultory.
She is temperamental.

Question

What's the correct word to describe them?
If someone get tired of things easily,  (lover, stuff, hobby, dress etc.)

What's the correct word to describe them?

She is whimsical.
She is fickle.
She is whimsy.
She is whimsey.
She is desultory.
She is temperamental.

Answer

Only 'fickle' (2)  would work. Sentences 3/4 make no sense. The other three words have different meanings that don't fit the situation.