1. Showing a lack of attention or care
   "unattentive students";
   - inattentive
    
2. Not showing due care or attention
   "the parents were unattentive to his needs";
   - inattentive, neglectful

See also: absent, absentminded, abstracted, attention, careless, cavalier, distracted, distrait, dopey, dopy, dreamy, drowsy, forgetful, mindless, moony, negligent, oblivious, oscitant, scatty [Brit, informal], unmindful, woolgathering, yawning