QUIXOTIC implies a devotion to romantic or chivalrous ideals unrestrained by ordinary prudence and common sense. a quixotic crusade
FANTASTIC, BIZARRE, GROTESQUE mean conceived, made, or carried out without adherence to truth or reality.
FANTASTIC may connote extravagance in conception or ingenuity of decorative invention. dreamed up fantastic rumors
BIZARRE applies to the sensationally strange and implies violence of contrast or incongruity of combination. a bizarre medieval castle in the heart of a modern city
GROTESQUE may apply to what is conventionally ugly but artistically effective or it may connote ludicrous awkwardness or incongruity often with sinister or tragic overtones. grotesque statues on the cathedral though grieving, she made a grotesque attempt at a smile