He noticed at once that discipline was slack: the Danes had the self-confidence of conquerors, and their security precautions were casual.

他马上发现丹麦军纪松弛，他们以征服者自居，安全措施马马虎虎。

youdao

Relatively slack personal security (he had no guards and his family used mobile phones) suggests he felt at ease, perhaps protected by others.

ECONOMIST: One year on, the story makes for a gripping read

Passengers may be thoroughly checked, but behind-the-scenes security is slack or non-existent, with inconsistent screening of mail, cargo and baggage, and an inadequate police presence, it said.

ECONOMIST: Canada