en_tn/pro/17/28.md

Even a fool is thought to be wise

This can be written in active form. Alternate translation: "People even think a fool is wise" (See: rc://en/ta/man/translate/figs-activepassive)

keeps his mouth shut

This means that he does not speak. Alternate translation: "does not speak" (See: rc://en/ta/man/translate/figs-idiom)

he is considered to be intelligent

This can be written in active form. Alternate translation: "people consider him to be intelligent" (See: rc://en/ta/man/translate/figs-activepassive)