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.

From the post: How Venezuela went from a wealthy South American country to a failing state
Source: Venezuela, a Failing State (newyorker.com)