Faithful are the wounds of a friend — i.e., the “open rebuke” of the previous verse, the “smiting” and “reproof” of Psalms 142:5.
The kisses of an enemy are deceitful. — Rather, plentiful, showered upon one, but all meaningless.
Related Commentaries of Proverbs 27:6
Proverbs 27:6
6 Faithful are the wounds of a friend; but the kisses of an enemy are deceitful.c