en_tn/job/19/16.md

but he gives me no answer

"but he does not respond to me" or "but he does not come to me." The answer is a response to Job's call.

although I entreat him with my mouth

The phrase "my mouth" is a metonym which refers to Job speaking. Alternate translation: "even though I speak to him and plead with him" (See: rc://en/ta/man/translate/figs-metonymy)

entreat him

"plead with him"