Synonyms for Ancient:

adj.

•aged (adjective)
durable, elderly, matured, geriatric, aged, ripe, old, superannuated, venerable, mature, octogenarian, vintage.
•in the beginning (adjective)
early.
•old (adjective)
archaic, venerable, primitive, aged, antique, primordial, old, timeworn, geriatric, paleolithic, antiquated, olden, antediluvian, elderly, primeval.
•old, often very old (adjective)
antiquated, venerable, bygone, hoary, antediluvian, early, superannuated, elderly, primordial, antique, aged, timeworn, age-old, primeval, archaic.
•outmoded (adjective)
old-time.
•past (adjective)
previous, yore, old-time, ago, former, primeval, bygone, anteceding, past, yesterday's, primordial, historical, old.

n.

ageing, ancestor, antiquity. classical, study at, early, anglo-saxon, basilica, archaeological, circus, archeological, classically. start. elder, old-timer, oldster, senior citizen, youth, senior, golden ager. •ancient (noun)
bygone, early, antique, age-old, antediluvian, primordial, aged, old, archaic, immemorial, superannuated, antiquated, primeval.
•person (noun)
antediluvian.

Other synonyms:

age-old, ancestor, archaeological, old-timer, senior citizen, early, golden ager. anglo-saxon, basilica, classical, antiquity, circus, oldster. classically, elder. senior.

Usage examples for ancient

1. It was very ancient – Vanishing England by P. H. Ditchfield

2. For ancient undoubtedly it was. – Allan and the Holy Flower by H. Rider Haggard

3. In all that valley the people were also of the ancient Guianians. – The Discovery of Guiana by Sir Walter Raleigh