A black mark given to a pupil who arrives at a lesson without the necessary items or preparation.
Unprepared Sentence Examples
Caught unprepared, he took the full force of it on his cheek.
He wasn't likely to be caught unprepared in the wild country that surrounded their house.
Discords must not be taken unprepared, because a singer can only find his note by a mental judgment, and in attacking a discord he has to find a note of which the harmonic meaning is at variance with that of other notes sung at the same time.
But the army was ill-equipped and unprepared; and Potemkin in an hysterical fit of depression gave everything up for lost, and would have resigned but for the steady encouragement of the empress.