Learner's definition of FUSSY
1 : very careful or too careful about choosing or accepting things: hard to please
a fussy shopper
She's always been fussy [=picky] about food.
I'm not fussy about where we eat.
This plant is not fussy about soil quality. [=this plant will grow well even in poor soil]
2 US : often upset or unhappy 3 disapproving : too fancy or complicated