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Adjective: lah-di-dah  ,laa-dee'daa
Usage: informal
  1. Affectedly genteel; to carry an air of affected importance; to be snobbish and haughty
    "They didn't expect all members of royalty to be so lah-di-dah";
    - grandiose, hifalutin [informal], highfalutin [informal], highfaluting [informal], hoity-toity [informal], la-di-da [informal], la-de-da [informal]

See also: pretentious