LATIN DICTIONARYLexicon Latīnum
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“alert” in Latin

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

alert
alacer (energetically active and in high spirits): vegetus (awake; alive both in body and mind): vividus, vigens (full of life and energy): promptus (ready, always prepared). (The words are found in this connection and order), alacer et promptus: acer et vigens. To be on the alert, vigliare, cavere, ne, etc.
Pert, smart: procax (boisterously forward from assurance and impudence): protervus (impetuously, recklessly, insolently forward): lascivus (full of fun and high spirits).

Quick answer

What is the Latin word for alert?
The usual Latin words for “alert” are alacer, vegetus, vīvidus; also vigeō, prōmō, procāx. 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.