fanciful, ideal, imaginary, visionary, chimerical, unreal, fabricated, fictitious

vain speculations

indulge in vain speculations or absurd fancies, build castles in the air

indulge in speculation, imagine, let thoughts roam

fresh thoughts

archaic mentality, outdated thinking

hallucination, daydreaming

capricious, whimsical

enlightenment, broad-mindedness

freshness of ideas

narrow outlook, point of view

delicacy or subtlety of idea or perception, elegance of thoughts

a pipe dream, vain imaginations, crude ideas, crude or wrong ideas, fancy,

immature, undeveloped

unmindful

imaginary figure, imaginary portrait

imaginary, whimsical topic

explaining a difficult idea with ease

the ideal being