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Adjective: goody-goody  'gû-dee'gû-dee
Usage: informal
  1. Affectedly or smugly good or self-righteous
    "Her goody-goody attitude annoyed her classmates"
Noun: goody-goody  'gû-dee'gû-dee
Usage: informal
  1. A person who behaves extremely well in order to please a superior
    "The class goody-goody always volunteered to help the teacher"

Derived forms: goody-goodies

See also: good

Type of: crawler, lackey, lacquey, sycophant, toady