Words related to dreary
c. 1300, drippen, "to fall in drops; let fall in drops," from Old English drypan, also dryppan, from Proto-Germanic *drupjanan (source also of Old Norse dreypa, Middle Danish drippe, Dutch druipen, Old High German troufen, German triefen), perhaps from a PIE root *dhreu-. Related to droop and drop. Related: Dripped; dripping.
1540s, transitive, "shed in small drops;" 1560s, intransitive, "fall in very fine particles, as water from the clouds," of uncertain origin. Perhaps it is an alteration of drysning "a falling of dew" (c. 1400), from Old English -drysnian, which is related to dreosan "to fall" (see dreary). Or perhaps it is a frequentative of Middle English dresen "to fall," from Old English dreosan. Related: Drizzled; drizzling.
As a noun, "a light rain, mist," from 1550s.