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Definitioncarefully observant or attentive — often to possible danger
- ...was their fuss about little matters, and marvellous, sometimes, the obtuseness that allowed greater ones to slip between their fingers Whenever such a mischance occurred—when a waggon-load of valuable merchandise had been smuggled ashore, at noonday, perhaps, and directly beneath their unsuspicious noses—nothing could exceed the vigilance and alacrity with which they proceeded to lock, and double-lock, and secure with tape and sealing-wax, all the avenues of the delinquent vessel.Introductory (28% in)
There are no more uses of "vigilant" in The Scarlet Letter.
Typical Usage (best examples)