The word "vigilant" itself means "watchful" or "alert," so it's already closely related to the roots you provided. However, if you're looking for a synonym, "watchful" or "alert" would be the best fits. Among those, "watchful" is particularly aligned with the meaning derived from the roots you mentioned.
the suffix -ant means "tending to" and the word root -vig means "watchful". which word is the best synonym for vigilant.
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