scatty

Adjective

• lost in thought; showing preoccupation
  • an absent stare
    
  • an absentminded professor
    
  • the scatty glancing quality of a hyperactive but unfocused intelligence
    

• lacking sense or discretion
  • his rattlebrained crackpot ideas
    
  • how rattlepated I am! I've forgotten what I came for- Glenway Westcott
    

Related words

• Synonyms: 
  absent , absentminded , abstracted , rattlebrained , rattlepated , scatterbrained