Strong's G2990 — λανθάνω (verb)
lanthano (lan-than'-o) v.
1. to lie hid
2. (adverbially, often) unwittingly
{literally or figuratively}
[a prolonged form of a primary verb, which is used only as an alternate in certain tenses]
KJV: be hid, be ignorant of, unawares 
Occurrences: 6