Strong's Concordance

Original word: ἀνεξιχνίαστος
Transliteration: anexichniastos
Definition (short): unfathomable
Definition (full): that cannot be traced out

NAS Exhaustive Concordance

Word Origin: from alpha (as a neg. prefix) and exichniazó (to track out)
Definition: that cannot be traced out
NASB Translation: unfathomable (2).
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Strong's Exhaustive Concordance

From a (as a negative particle) and a presumed derivative of a compound of ek and a derivative of ichnos; not tracked out, i.e. (by implication) untraceable -- past finding out; unsearchable.

see GREEK a

see GREEK ek

see GREEK ichnos

KJV: O the depth of the riches both of the wisdom and knowledge of God! how unsearchable are his judgments, and his ways past finding out!
NASB: Oh, the depth of the riches both of the wisdom and knowledge of God! How unsearchable are His judgments and unfathomable His ways!
KJV: Unto me, who am less than the least of all saints, is this grace given, that I should preach among the Gentiles the unsearchable riches of Christ;
NASB: To me, the very least of all saints, this grace was given, to preach to the Gentiles the unfathomable riches of Christ,