Definitions

1. adjective

exposed to the moon or light at night; not dark

“The nightless forest was teeming with nocturnal creatures.”

2. adjective

without night; always illuminated

“The nightless city was a marvel of modern engineering.”

3. adjective

not requiring rest or sleep; able to function at night

“The nightless athlete trained through the night and still performed well in the morning.”

4. adjective

not dark or gloomy; cheerful

“The nightless atmosphere of the party was infectious, and everyone was having a great time.”