SAT GRE IELTS vigilant Definition Careful and watchful to avoid danger or mistakes. Example "Be vigilant when walking alone at night." Sign in to save SAT Quiz → GRE Quiz → IELTS Quiz → ← vigilance vignette → Study tips featuring "vigilant" Map the Author's Attitude Before Reading Questions Audit Your Own Writing for Lexical Resource Force Contrast Between Two Similar Words Related words SAT antonym SAT abase SAT abdicate SAT abdomen SAT abduction SAT abet SAT abeyance SAT abject SAT abjure SAT ablution SAT abnegate SAT abnormal