Deceitful - Better, abundant. Very lavish is the enemy of the kisses that cover perfidy, but lavish of them only. His courtesy goes no deeper.

Faithful [are] the wounds of a friend; but the kisses of an enemy [are] (c) deceitful.
(c) They are flattering and seem friendly.

Faithful are the wounds of a friend,.... That is, friendly reproofs; which, though they may be severe, at least thought so, and may grieve and wound, and cause pain and uneasiness for the present, yet, proceeding from a spirit of love, faithfulness, and integrity, and designed for the good of the person reproved, ought to be kindly received; see Psalm 141:5;
but the kisses of an enemy are deceitful; flow from a deceitful heart, and not to be confided in, as the kisses of Joab and Judas. It may be rather rendered, "are to be deprecated" (y); prayed against, as real evils, hurtful and pernicious; and so the Targum renders it, "are evil". Good is the advice of Isocrates (z),
"reckon them faithful, not who praise everything thou sayest or doest, but those that reprove what is amiss.''
(y) "deprecanda", Junius & Tremillius, Piscator, Cocceius, Amama. (z) Ad Nicoclem, p. 38.

6 Faithful are the wounds of a friend,
And overloaded [plentiful] the kisses of an enemy.
The contrast to נאמנים, true, i.e., honourable and good (with the transference of the character of the person to his act), would be fraudulenta (Jerome), or נהפכות, i.e., false (Ralbag); Ewald seeks this idea from עתר, to stumble, make a false step;
(Note: Thus also Schultens in the Animadversiones, which later he fancied was derived from עתר, nidor, from the meaning nidorosa, and thence virulenta.)
Hitzig, from עתר = (Arab.) dadhr, whence dâdhir, perfidus, to gain from; but (1) the comparison does not lie near, since usually the Arab. t corresponds to the Hebrews. שׁ, and the Arab. d to the Hebrews. ז; (2) the Hebrews. עתר has already three meanings, and it is not advisable to load it with yet another meaning assumed for this passage, and elsewhere not found. The three meanings are the following: (a) to smoke, Aram. עטר, whence עתר, vapour, Ezekiel 8:11, according to which the Venet., with Kimchi's and Parchon's Lex., translates: the kisses of an enemy συνωμίχλωνται, i.e., are fog; (b) to sacrifice, to worship, Arab. atar; according to which Aquila: ἱκετικά (as, with Grabe, it is probably to be read for ἑκούσια of the lxx); and agreeably to the Niph., but too artificially, Arama: obtained by entreaties = constrained; (c) to heap up, whence Hiph. העתיר, Ezekiel 35:13, cf. Jeremiah 33:6, according to which Rashi, Meri, Gesenius, Fleischer, Bertheau, and most explain, cogn. with עשׁר, whose Aram. form is עתר, for עשׁר is properly a heap of goods or treasures.
(Note: Vid., regarding this word, Schlottmann in Deutsch.-Morgenl. Zeitschrift, xxiv. 665, 668.)
This third meaning gives to the kisses of an enemy a natural adjective: they are too abundant, so much the more plentiful to veil over the hatred, like the kisses by means of which Judas betrayed his Lord, not merely denoted by φιλεῖν, but by καταφιλεῖν, Matthew 26:49. This, then, is the contrast, that the strokes inflicted by one who truly loves us, although they tear into our flesh (פּצע, from פּצע, to split, to tear open), yet are faithful (cf. Psalm 141:5); on the contrary, the enemy covers over with kisses him to whom he wishes all evil. Thus also נעתרות forms an indirect contrast to נאמנים.

Wounds - The sharpest reproofs. Kisses - All the outward profession of friendship.