Answer: antediluvian

AnswerCrossword Clue
ANTEDILUVIANBelonging to the period before the Flood [1994]
ANTEDILUVIANPrimitive.
ANTEDILUVIANVery old and outmoded
antediluvianvery old, old-fashioned, or out of date; antiquated.
antediluvianpertaining to the period before the Biblical flood or any great flood also ANTEDILUVIAL / someone or something occurring in the period before the Flood
antediluvianbefore the Biblical Flood
antediluvianextremely old.