Meaning : A person given to fanciful speculations and enthusiasms with little regard for what is actually possible.
Meaning : A person with unusual powers of foresight.
Synonyms : illusionist, seer
Meaning : Not practical or realizable. Speculative.
Example :
Airy theories about socioeconomic improvement.
Visionary schemes for getting rich.
Synonyms : airy, impractical, laputan, windy