1. Vigilant, watchful: This is the most common meaning. It can describe someone who is attentive and alert, paying close attention to their surroundings. For example, "Le gardien était veilleux toute la nuit." (The guard was vigilant all night.)
2. Late-night, nocturnal: This meaning refers to activities or events that happen late at night. For example, "Un concert veilleux." (A late-night concert.)
3. Wakeful, sleepless: This meaning refers to someone who is unable to sleep. For example, "Elle était veilleuse toute la nuit à cause du bruit." (She was wakeful all night due to the noise.)
4. Candle, lamp: This meaning is less common and is only used in certain regions. It refers to a candle or lamp used for lighting. For example, "La veilleuse de la grand-mère." (The grandmother's lamp.)
Therefore, the best translation of "veilleux" depends on the context of the sentence.