Lexical Definition

‎ἀνεξιχνίαστος‎ anexichníastos (an-ex-ikh-nee'-as-tos) unsearchable ^G:A
from ‎Α‎ (as a negative particle) and a presumed derivative of a compound of ‎ἐκ‎ and a derivative of ‎ἴχνος‎

past finding out; unsearchable.

• not tracked out, i.e. (by implication) untraceable

Abbott-Smith

† ἀνεξιχνίαστος, -ον (< ἀ- neg., ἐξιχνιάζω, to track out; < ἴχνος), [in LXX: Jb 5:9 9:10 34:24 (חֵקֶר אֵין)*;]
that cannot be traced out: Ro 11:33, Eph 3:8 (MM, VGT, s.v.).†

Abbott-Smith References

Liddell-Scott-Jones

ἀνεξιχνίαστος-ιχνίαστος, ον,

unsearchable, inscrutable, [LXX+NT]

_{LSJ Scripture Refs: LXX.Job.5.9 ☩ Rom.11.33 ☩ Eph.3.8}