Fussily
/ˈfʌsəli/
Definition 1 of 1
Pro Tip 1/3Attention to Detail
Used when someone pays extra attention to small, often minor details. 
She fussily inspected each flower in the bouquet.
Pro Tip 2/3Conveys Annoyance
May imply that the attention to detail is excessive or unnecessary. 
He fussily complained about the position of the cutlery.
Pro Tip 3/3Not Always Positive
Although it means being thorough, it can have a negative connotation. 
The teacher fussily marked every slight mistake.