| Barnes' Notes on the Bible Servant - i. e., A slave, whose obedience is reluctant. He may "understand" the words, but they produce no good effect. There is still lacking the true "answer" of obedience.
Gill's Exposition of the Entire BibleA servant will not be corrected by words,.... Not by them only, especially one that is of a servile, surly, and untractable disposition; otherwise a good servant, and well disposed to his master, and willing to serve him, and promote his interest, a word is sufficient for such an one; when he is bid to go, he goes; or to come, he comes, Matthew 8:9; or if he has done wrong, and his fault is told him, he will amend another time; whereas a rough ill natured servant will not regard words, but must have blows to correct him; for though he understand; what his master says, and what is his will, and knows he has done wrong, and ought to do otherwise, which is an aggravation of sin: he will not answer; own his fault and promise to do better for the future; through the surliness of his nature, and contempt of his master, whom he does not think worthy of an answer: so the Vulgate Latin version renders it, "he despises to answer"; thus Job was used by his servants, Job 19:16; There is an answering which is forbidden servants, Titus 2:9; but this what becomes them, and is expressive of their respect and reverence to their masters, and their ready, hearty, and cheerful obedience to them; and which especially should be in Christian servants to Christian masters, 1 Timothy 6:1.
Keil and Delitzsch Biblical Commentary on the Old TestamentFrom the discipline of the people this series of proverbs again returns to the discipline of home: 19 With words a servant will not let himself be bettered; For he understandeth them, but conformeth not thereto. The Niph. נוסר becomes a so-called tolerative, for it connects with the idea of happening that of reaching its object: to become truly bettered (taught in wisdom, corrected), and thus to let himself be bettered. With mere words this is not reached; the unreasonable servant needs, in order to be set right, a more radical means of deliverance. This assertion demands confirmation; therefore is the view of von Hofmann (Schriftbew. ii. 2. 404) improbable, that 19b has in view a better-disposed servant: supposing that he is intelligent, in which case he is admonished without cause, then the words are also lost: he will let them pass over him in silence without any reply. This attempted explanation is occasioned by this, that מענה can signify nothing else than a response in words. If this were correct, then without doubt its fundamental meaning would correspond with כּי; for one explains, with Lwenstein, "for he perceives it, and may not answer," i.e., this, that a reply cut off frustrates the moral impression. Or also: for he understands it, but is silent - in praefractum se silentium configit (Schultens); and thus it is with the ancients (Rashi). But why should not ואין מענה itself be the expression of this want of any consequences? מענה cannot certainly mean humiliation (Note: The Syr. and Targ. also think on ענה, for they translate: "for he knows that he receives no strokes.") (Meri, after Exodus 10:3, הכנעה), but why as an answer in words and not also a response by act (Stuart: a practical answer)? Thus the lxx ἐὰν γὰρ καὶ νοήσῃ, ἀλλ ̓ οὐχ ὑπακούσεται, according to which Luther: for although he at once understands it, he does not yet take it to himself. That מענה tahT . may mean obedience, the Aram. so understood, also at Proverbs 16:4. It denoted a reply in the most comprehensive meaning of the word, vid., at Proverbs 16:1. The thought, besides, is the same as if one were to explain: for he understands it, and is silent, i.e., lets thee speak; or: he understands it, but that which he perceives finds no practical echo.
Geneva Study BibleA {e} servant will not be corrected by words: for though he understandeth he will not answer. (e) He who is of a servile and rebellious nature.
Wesley's Notes 29:19 A servant - Who is so not only in condition, but also in the temper of his mind, disingenuous, and stubborn. Words - By mere words. Tho' - Though he know thy mind, and his own duty.
Jamieson-Fausset-Brown Bible Commentary19. A servant-who lacks good principle. corrected-or discovered. will not answer-that is, will not obey.
Matthew Henry's Concise Commentary29:19. Here is an unprofitable, slothful, wicked servant; one that serves not from conscience, or love, but from fear. 20. When a man is self-conceited, rash, and given to wrangling, there is more hope of the ignorant and profligate. 21. Good usage to a servant does not mean indulgence, which would ruin even a child. The body is a servant to the soul; those that humour it, and are over-tender of it, will find it forget its place. 22. An angry, passionate disposition makes men provoking to one another, and provoking to God. 23. Only those who humble themselves shall be exalted and established. 24. The receiver is as bad as the thief. 25. Many are ashamed to own Christ now; and he will not own them in the day of judgment. But he that trusts in the Lord will be saved from this snare.
Matthew Henry's Whole Bible CommentaryVerse 19 Here is the description of an unprofitable, slothful, wicked servant, a slave that serves not from conscience, or love, but purely from fear. Let those that have such servants put on patience to bear the vexation and not disturb themselves at it. See their character. 1. No rational words will work upon them; they will not be corrected and reformed, not brought to their business, nor cured of their idleness and laziness, by fair means, no, nor by foul words; even the most gentle master will be forced to use severity with them; no reason will serve their turn, for they are unreasonable. 2. No rational words will be got from them. They are dogged and sullen; and, though they understand the questions you ask them, they will not give you an answer; though you make it ever so plain to them what you expect from them, they will not promise you to mend what is amiss nor to mind their business. See the folly of those servants whose mouth by their silence calls for strokes; they might be corrected by words and save blows, but they will not. | 
