goody-goody

(go̵odē go̵od′ē)

adjective

moral or pious in an affected or canting way

Origin: redupl. of goody

noun

a goody-goody person

See goody-goody in American Heritage Dictionary 4

adjective
Affectedly sweet, good, or virtuous.
noun pl. good·y-good·ies
One who is affectedly sweet, good, or virtuous.

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