WordWeb Online

1. Having or revealing stupidity
   "ridiculous dopy behaviour"
   - anserine, dopey, foolish, goosey, goosy, gooselike, jerky
    
2. Half asleep
   "it seemed a pity to disturb the dopy professor"
   - drowsy, drowsing, dozy, dopey
    
3. Showing lack of attention or boredom
   "the dopy congregation"
   - drowsy, oscitant, yawning, dopey

Derived forms: dopiest, dopier

See also: asleep, dope, inattentive, stupid