goody-goody

• POS: Adjective, Noun
• HYPHEN: good=y-good=y

CIDE DICTIONARY

goody-goody, a. 

 Mawkishly or weakly good; exhibiting goodness with silliness.  [1913 Webster]

goody-goody, n. 

 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.  [PJC]

OXFORD DICTIONARY

goody-goody, n. & adj. colloq.
--n. a smug or obtrusively virtuous person.
--adj. obtrusively or smugly virtuous.