The country lacked the resources and was unprepared for a protracted war.El país no contaba con recursos suficientes y no estaba preparado para una guerra prolongada.
I was totally unprepared for the next question he asked me.No esperaba en absoluto la siguiente pregunta que me hizo.
Those who staged the coup were unprepared for the resistance they would encounter from the people.Los golpistas no habían previsto la resistencia que el pueblo opondría.
When the speaker didn't turn up, I had to give an unprepared lecture in her place.Como no vino la oradora, tuve que dar una charla improvisada en su lugar.