goody two shoes
noun
An ostentatiously virtuous or well-behaved person: she was such a goody two shoes I don’t drink alcohol. Goody two shoes, that’s me...
- About the only thing Ashcroft is guilty of is being a goody two shoes.
- Dan's brother is such a goody two-shoes, he probably doesn't even know the meaning of the phrase ‘lying through your teeth’.
- His character goes in one scene from an insufferably noble goody two shoes to a mean spirited madman that's so cold blooded that he barely breaks a sweat in the sauna.
Origin
Mid 18th-century: from the nickname of the heroine of History of Little Goody Two-shoes (1766), a popular children's story in which an orphan girl triumphs over adversity through her unwavering virtue and hard work to become a teacher and marry a rich man, using her new-found wealth to help the poor and do good works.