LATIN DICTIONARYLexicon Latīnum
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“vigilant” in Latin

The English word vigilant itself goes back to Latin vigil, through vigilans.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

vigilant
vigilans: vigil. To be vigilant, vigilare: advigilare: to be very vigilant, mirifica esse vigilantia: to keep a vigilant eye upon, diligenter custodire aliquid or aliquem: to be vigilant in anybody’s service, excubare vigilareque pro aliquo (Cic.): vigilant care, vigilantes curae (Cic., IMPROP.). If cautious, Vid.

Quick answer

What is the Latin word for vigilant?
The usual Latin words for “vigilant” are vigilō, vigil, advigilō. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.