adjective.
Inclined to drowse; heavy with sleepiness; lethargic; dozy.
adjective.
Disposing to sleep; lulling; soporific.
adjective.Dull; stupid.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adjective.
half asleep
adjective.
showing lack of attention or boredom
Word Usage
"Czeisler thinks frequent problems with what he calls "drowsy driving" help explain why car accidents have overtaken criminal assaults as the top cause of death among police officers."