Synonyms for Seen:

adj.

observed (adjective)
observed.

n.

Borne, Befallen, Bidden, Begun, blown, bitten, Bestridden, Arisen, Been, begotten.

v.

manifest (verb)
evident, obvious.
saw (verb)
observed, Discerned, beholden, perceived, Glanced, Beheld, peeked, witnessed, Glimpsed, Looked, Spied, Watched, Peered, stared, Regarded, Viewed, Glared, saw, Inspected, Gazed, sighted.

Other synonyms:

Other relevant words:
evident, obvious.