archaic in WordNet English dictionary

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