Oscitancy is the act of yawning, which is a common occurrence especially when someone is feeling sleepy or tired. However, there are various antonyms for this word that can be used to express the opposite of yawning. Some of the antonyms for oscitancy include alertness, wakefulness, energy, liveliness, and vivacity. When one is alert, they are not sleepy or yawning. Wakefulness indicates being fully awake and aware of one's surroundings. Energy, liveliness, and vivacity refer to a high degree of vitality and enthusiasm, which are the opposite of being tired and lethargic. Using antonyms can help express a different shade of meaning, and prevent repetitive language use.