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comparative more vigilant, superlative most vigilant
Watchful, especially for danger or disorder; alert; wary examples
(heraldry, rare) In vigilance. quotations
von der LUTKE / Argent, a crane vigilant proper. AG. Carl von der Lutke. Arr. 1857 with the British German Crimea legion. Obtained a grant of land in the Eastern Province of the Cape Colony.
1972, C. Pama, Heraldry of South African Families: Coats of Arms/ Crests/ Ancestry
[...] and sharing the same heraldry : argent, a crane, vigilant, or, […]
1997, Saint Thomas More, More to Cranevelt, Leuven University Press, page 23