visionary

Adjective

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

Noun

• a person with unusual powers of foresight

• a person given to fanciful speculations and enthusiasms with little regard for what is actually possible

Related words

• Synonyms: 
  airy , impractical , Laputan , windy , illusionist , seer