Charles Ellicott Commentary Zechariah 11:15

"And Jehovah said unto me, Take unto thee yet again the instruments of a foolish shepherd." — Zechariah 11:15 (ASV)

Instruments of a foolish shepherd. —It is needless to inquire in what respects, if any, these instruments differed from those of a wise shepherd. The words merely imply that the prophet, having represented the one character, should now personate the other.

Foolish is almost equivalent to “wicked” in Bible language, whether this word is used, or that from Psalm 53:2.