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Definition of antediluvian : 1. Of or relating to the period before the Deluge in Noah's time; hence, antiquated; as, an antediluvian vehicle.
2. One who lived before the Deluge.

Synonyms:

aging, out-of-date, hoar, old-time, olden, age-old, ageing, old-fashioned, early, immemorial, ancestor, hoary, timeworn, antediluvian patriarch, new, start, antediluvial, dateless, antiquity

archaic, primordial, aged, elderly, old, antiquated, venerable, antique, primitive, paleolithic, primeval, ancient

Usage examples:

• Of one point there can be little doubt- that bores existed in ancient as well as in modern times, though the deluge has unluckily swept away all traces of the antediluvian bore- a creature which analogy leads us to believe must have been of formidable power. - "Tales & Novels, Vol. IX [Contents: Harrington; Thoughts on Bores; Ormond]", Maria Edgeworth.
• The incident I propose to relate occurred in antediluvian times, when there were giants in the earth who lived a thousand years. - "Daybreak: A Romance of an Old World", James Cowan.
• In many parts of our coasts we find very striking and enormously large boulder- stones lying on the beach, perfectly isolated, and their edges rounded away like pebbles, as if they had been rolled on some antediluvian beach strewn with Titanic stones. - "The Ocean and its Wonders", R.M. Ballantyne.