Strong's G3921 — παρεισδύνω (verb)
pareisduno (par-ice-doo'-no) v.
1. to settle in alongside, i.e. lodge stealthily
[from G3844 and a compound of G1519 and G1416]
KJV: creep in unawares 
Root(s): G3844, G1519, G1416 
Hebrew root: εἰς
Occurrences: 1