visionary

nouns

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

visionary

is a type of (narrower)

a human being

"there was too much for one person to do"

a person with unusual powers of foresight

illusionist, seer, visionary

not practical or realizable; speculative

"airy theories about socioeconomic improvement"; "visionary schemes for getting rich"

Laputan, airy, impractical, visionary, windy

is derived from