goody two shoes

US /ˈɡʊd.i ˈtuː ˌʃuːz/
UK /ˈɡʊd.i ˈtuː ˌʃuːz/
"goody two shoes" picture
1.

santarellino, bacchettone

a person who is excessively virtuous, obedient, and well-behaved, often to the point of being annoying or smug

:
She's such a goody two shoes, always following the rules and never having any fun.
È una vera santarellina, segue sempre le regole e non si diverte mai.
He was teased for being a goody two shoes because he always finished his homework on time.
È stato preso in giro per essere un santarellino perché finiva sempre i compiti in tempo.