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a.1.Without a guard or defense; unguarded.
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This brings me to the ridiculous idea of Merseyrail introducing guardless trains.
The first one is characterized by "ElArgar" or "Carrapatas" halberd representations, guardless daggers, foliaceous points and rectangular shields.
At a time when passengers are being forced to pay the most expensive train fares in Europe, they also face the prospect of unstaffed stations and guardless trains.