Goody-goody

a.	1.	Mawkishly or weakly good; exhibiting goodness with silliness.
n.	1.	A person who is weakly, sentimentally, or affectedly good; a goody-goody person; - sometimes used to refer to person who acts with good intentions but who bunglingly does more harm than good. The latter may sometimes be deprecatingly referred to as a goo-goo.

Noun	1.	goody-goody - a person who behaves extremely well in order to please a superior
Adj.	1.	goody-goody - affectedly or smugly good or self-righteous

good