Rainy
来自Big Physics
Old English rēnig (see rain, -y1).
wiktionary
From Middle English reyny, from Old English *reġniġ, rēniġ(“rainy”), from Proto-Germanic *regnagaz(“rainy”), equivalent to rain + -y.
etymonline
rainy (adj.)
"abounding with or giving out rain," Middle English reini, from Old English renig; see rain (n.) + -y (2). Rainy day in a figurative sense of "a time of greater need or clouded fortunes" is by 1570s.
