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Adjective: decorous  de-ku-rus
  1. According with custom or propriety
    "her decorous modesty";
    - becoming, comely [archaic], comme il faut, seemly
  2. Characterized by propriety and dignity and good taste in manners and conduct
    "the tête-à-tête was decorous in the extreme"

See also: in good taste, proper, sedate, staid

Antonym: indecorous

Encyclopedia: Decorous