Whimsical
In Persian خیالپردازانه و بازیگوش (khīyāl-pardāzāneh va bāzīgūsh) / دمدمیمزاج (damdamī-mezāj) – but less negative
Playfully quaint or fanciful, especially in an appealing and amusing way.
Example
"The artist's paintings had a whimsical quality."
