moonless

From moon +‎ -less.

moonless (not comparable)

1. (of a night) During which no phase of the Moon is visible to provide light, whether because of cloud cover or because of a new moon.

   Antonyms: moonlit, moonful

   Coordinate term: starless

   • 1922, E[ric] R[ücker] Eddison, The Worm Ouroboros: A Romance, London: Jonathan Cape […], →OCLC, page 31:

     And they played softly in the Aeolian mode a music that was like the wailing of wind through bare branches on a moonless night, and the Red Foliot leaned forth from his high seat and recited this lamentation: […]

2. (informal, of a planet) Having no natural satellite.