snoopy
Definitions
Given to prying into the affairs of others; inquisitive.
Characterized by an intrusive or overly curious nature.
Examples
She was always a bit snoopy, constantly checking her neighbors' mailboxes to see what they had ordered.
I wish my younger brother wouldn't be so snoopy whenever I have friends over to visit.
Synonyms
inquisitive curious prying nosy meddlesome intrusive interfering
Antonyms
indifferent uninterested disinterested aloof unconcerned detached reserved