Proverbs 17:28

New English Translation

²⁸Even a fool who remains silent is considered^[a] wise,
and the one who holds his tongue is deemed discerning.^[b]

Proverbs 17:28 tn The imperfect tense here denotes possibility: One who holds his tongue [may be considered] discerning.
Proverbs 17:28 tn The Niphal participle is used in the declarative/estimative sense with stative verbs: “to be discerning” (Qal) becomes “to be declared discerning” (Niphal). The proverb is teaching that silence is one evidence of wisdom, and that even a fool can thereby appear wise. D. Kidner says that a fool who takes this advice is no longer a complete fool (Proverbs [TOTC], 127). He does not, of course, become wise—he just hides his folly.

New English Translation (NET)