Unrealistic (8)
'unrealistic' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for quixotic that I've seen before include "Visionary" , "Unworldly" , "Absurdly impractical" , "Having impractical ideas" , "Extravagantly chivalrous like Cerantes' Don" .)
'unrealistic' is the definition.
(thesaurus)
This is the entire clue.
(Other definitions for fanciful that I've seen before include "Imaginary, not based in reality" , "Not based on fact, unreal" , "Whimsical" , "Imaginary - unlikely to be of use" , "Fantastic" .)