impractical

Adjective

• not practical or realizable; speculative
  • airy theories about socioeconomic improvement
    
  • visionary schemes for getting rich
    

• not practical; not workable or not given to practical matters
  • refloating the ship proved impractical because of the expense
    
  • he is intelligent but too impractical for commercial work
    
  • an impractical solution
    

Related words

• Synonyms: 
  airy , visionary , Laputan , windy