Job 15:5 New English Translation

⁵Your sin inspires^[a] your mouth;
you choose the language^[b] of the crafty.^[c]

Job 15:5 tn The verb אַלֵּף (ʾallef) has the meaning of “to teach; to instruct,” but it is unlikely that the idea of revealing is intended. If the verb is understood metonymically, then “to inspire; to prompt” will be sufficient. Dahood and others find another root, and render the verb “to increase,” reversing subject and object: “your mouth increases your iniquity.”
Job 15:5 tn Heb “tongue.”
Job 15:5 tn The word means “shrewd; crafty; cunning” (see Gen 3:1). Job uses clever speech that is misleading and destructive.

New English Translation (NET)