A goody-goody - Idioms by The Free Dictionary
1. noun Someone who exclusively follows the rules and caters to authority figures; a teacher's pet. Jill's classmates called her a goody-goody after she volunteered to supervise the class while the teacher was away.
2. adjective Self-righteous or sanctimonious. Forget your goody-goody rules and go out on a school night for once!
a goody ˈtwo-shoes (informal, disapproving) a person who behaves very well to please people in authority such as parents or teachers: Don’t be such a goody-goody! ♢ He’s a real goody two-shoes. He’d never do anything that might get him into trouble.
References in classic literature
Aren't you ashamed of being such a goody-goody
, and of studying so hard?
Similarly, a goody-goody
teacher seems to be the unique professional--one with a fantastic figure--but empty-minded.