fussy
Definitions
Hard to please or satisfy; fastidious.
Requiring or involving much attention to detail or unnecessary complexity.
Easily upset or irritable, especially in reference to a child.
Examples
My cat is very fussy about what brand of food she eats.
The toddler was quite fussy after missing his afternoon nap.
He is a fussy eater who refuses to touch any green vegetables.
Synonyms
fastidious picky finicky particular demanding fretful persnickety
Antonyms
easygoing laid-back unfussy carefree indifferent relaxed undemanding