Synonyms for Unapparent:

adj.

impalpable (adjective)
indiscernible, unobservable, imperceptible.
intangible (adjective)
invisible.
invisible (adjective)
indiscernible, latent, dark, Obscured, veiled, imperceptible, camouflaged, concealed, unobservable, hidden, covert, invisible.
latent (adjective)
covert, veiled, clandestine, invisible, hidden, concealed, latent, buried, unexposed, unobservable, camouflaged, unrevealed.

n.

unapparent (noun)
unobvious.

Other synonyms:

Other relevant words:
unobvious.