Strong's G421 — ἀνεξιχνίαστος (adjective)
anexichniastos (an-ex-ikh-nee'-as-tos) adj.
1. not tracked out
2. (by implication) untraceable
[from G1 (as a negative particle) and a presumed derivative of a compound of G1537 and a derivative of G2487]
KJV: past finding out; unsearchable 
Root(s): G1, G1537, G2487 
Hebrew root: ἐκ
Occurrences: 2