Fine-leaved refers to plants or trees with small or delicate leaves which are usually slender or thin. Synonyms for fine-leaved can include words like feathery, delicate, wispy, slender, narrow, and dainty.
Feathery is an especially appropriate synonym as it denotes the light, airy quality of fine-leaved foliage, while delicate conveys the fragility of these leaves. On the other hand, wispy suggests a thinness and softness of the leaves. Slender and narrow, too, are apt synonyms as they describe the narrowness of the leaves. Dainty connotes a delicate beauty and can be used to describe the leaves of fine-leaved plants. These synonyms can be used in place of fine-leaved wherever precision and variety in language is desired.