picky

As adjectives the difference between fastidious and picky

is that fastidious is excessively particular, demanding, or fussy about details, especially about tidiness and cleanliness while picky is fussy; particular; demanding to have things just right.

As a noun picky is

a picture.

As an adjective picky

is fussy; particular; demanding to have things just right.

As a noun picky

is a picture.

As an adverb pickily is

in a picky way; pedantically.

As adjectives the difference between picky and finickety

is that picky is fussy; particular; demanding to have things just right while finickety is (colloquial) finicky; picky.

As a noun picky

is (informal) a picture.