vigilant – 1. giving careful attention to what is happening, so that you will notice any danger or illegal activity;
2. ever awake and alert; sleeplessly watchful.
бдительный; неусыпный
// Please remain vigilant at all times and report anything suspicious.
// When traveling through the city, tourists should be extra vigilant.
// They were vigilant about protecting their children.
// We remain vigilant against theft.
vigilant