drowsy
Concise Oxford English Dictionary © 2008 Oxford University Press:
drowsy/ˈdraʊzi/
▶adjective (drowsier, drowsiest) sleepy and lethargic.
– derivatives
drowsily adverb,
drowsiness noun.
drowsily adverb,
drowsiness noun.
– origin C15: prob. from the stem of OE drūsian ‘be languid or slow’, of Gmc origin; rel. to dreary.
'drowsy' also found in these Oxford entries:

