vigilant

The definition of vigilant is watchful and alert.

(adjective)

An example of something vigilant is a guard dog.

See vigilant in Webster's New World College Dictionary

adjective

staying watchful and alert to danger or trouble

Origin: Fr < L vigilans, prp. of vigilare, to watch < vigil, awake: see vigil

Related Forms:

See vigilant in American Heritage Dictionary 4

adjective

On the alert; watchful. See Synonyms at aware.

Origin:

Origin: Middle English

Origin: , from Old French

Origin: , from Latin vigilāns, vigilant-

Origin: , present participle of vigilāre, to be watchful; see vigilante

Related Forms:

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