1. Lacking caution as a result of naïveté or inexperience
2. Unprepared; not watchful
… Lufthansa left in June, swallowing a loss of more than a hundred million dollars. American Airlines wrote off more than half a billion dollars in Venezuela earlier this year. At the Caracas airport, unwary travellers are robbed, and worse, by taxi-drivers. The sensation of being monitored—by suspicious officialdom, by scammers, by predators—is thick in the airport. But a mood of grief is thicker still.