UNSEEN
unanticipated, unforeseen, unseen, unlooked-for, out of the blue
(adjective) not anticipated; “unanticipated and disconcerting lines of development”- H.W.Glidden; “unforeseen circumstances”; “a virtue unlooked-for in people so full of energy”; “like a bolt out of the blue”; “unseen problems”
unobserved, unseen
(adjective) not seen or observed; “managed to slip away unobserved”; “unseen forces at work”
unseen
(adjective) not seen or perceived; “unseen natural resources”
Source: WordNet® 3.1
Etymology 1
Adjective
unseen (not comparable)
Not seen or discovered; invisible.
Unskilled; inexperienced.
Not hitherto noticed; unobserved.
Etymology 2
Verb
unseen
past participle of unsee
Noun
unseen (plural unseens)
An examination involving material not previously seen or studied.
I have French and Latin unseens this summer.
Source: Wiktionary
Un*seen", a.
1. Not seen or discovered.
2. Unskilled; inexperienced. [Obs.] Clarendon.
Source: Webster’s Unabridged Dictionary 1913 Edition