1. 
[syn: drowsy, drowsing(a), dozy]
The Collaborative International Dictionary of English v.0.48:
drowsing \drowsing\ adj. prenom.
   sleeping lightly.
   Syn: drowsy, dozing(prenominal), napping(prenominal),
        nodding(prenominal).
        [WordNet 1.5]
The Collaborative International Dictionary of English v.0.48:
Drowse \Drowse\ (drouz), v. i. [imp. & p. p. Drowsed (drouzd);
   p. pr. & vb. n. Drowsing.] [AS. dr[=u]sian, dr[=u]san, to
   sink, become slow or inactive; cf. OD. droosen to be sleepy,
   fall asleep, LG. dr[=u]sen, druusken, to slumber, fall down
   with a noise; prob, akin to AS. dre['o]san to fall. See
   Dreary.]
   To sleep imperfectly or unsoundly; to slumber; to be heavy
   with sleepiness; to doze. "He drowsed upon his couch."
   --South.
   [1913 Webster]
         In the pool drowsed the cattle up to their knees.
                                                  --Lowell.
   [1913 Webster]
WordNet (r) 3.0 (2006):
drowsing
    adj 1: half asleep; "made drowsy by the long ride"; "it seemed a
           pity to disturb the drowsing (or dozing) professor"; "a
           tired dozy child"; "the nodding (or napping) grandmother
           in her rocking chair" [syn: drowsy, drowsing(a),
           dozy]