1. (

• antediluvian ,
• antiquated ,
• archaic

) so extremely old as seeming to belong to an earlier period; "a ramshackle antediluvian tenement"; "antediluvian ideas"; "archaic laws" ;

2. (

• archaic ,
• primitive ,

) 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" ;