The old dog was stubbornly uninstructible, refusing every attempt to learn new tricks.

She commented uninstructively during the rehearsal, leaving the singers confused.

The uninstructiveness of the lecture left the students confused and unprepared for the exam.

Her uninstructive feedback made it hard for me to improve.

The uninstructed volunteers accidentally redirected donations to the wrong account.

The new recruit's uninstructable attitude frustrated the entire team.

The manual was so uninstructing that employees still had no idea what to do.