1. So extremely old as seeming to belong to an earlier period (synset 301643372)
    "a ramshackle antediluvian tenement"; "antediluvian ideas"; "archaic laws"
  2. Little evolved from or characteristic of an earlier ancestral type (synset 300821300)
    "archaic forms of life"; "primitive mammals"; "the okapi is a short-necked primitive cousin of the giraffe"

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