Drowsy
来自Big Physics
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late 15th century: probably from the stem of Old English drūsian ‘be languid or slow’, of Germanic origin; related to dreary.
wiktionary
From drowse + -y, despite the fact that drowsy (1520) is recorded before drowse (1570). Compare Old English drūsian(“to droop, drowse, become languid”).
etymonline
drowsy (adj.)
"inclined to sleep, sleepy," 1520s, probably ultimately from Old English drusan, drusian "sink," also "become languid, slow, or inactive" (related to dreosan "to fall;" see dreary). There is no record of it in Middle English. Related: Drowsily; drowsiness.
