(くうそう)

くうそう
noun, suru-verb
fantasy, daydream, imagination
1. fantasy, daydream, imagination
Imaginative thoughts or ideas that are not based in reality; fanciful thinking.
As a child, I played in a world of fantasy.
I like science fiction novels.
空想(くうそう)科学(かがく)小説(しょうせつ) = science fiction (SF)
While lost in daydreams, time passed.

空想(くうそう) refers to imaginative or fanciful thinking disconnected from reality.

Common expressions:

  • 空想(くうそう)にふける (to be lost in fantasy/daydreams)
  • 空想(くうそう)科学(かがく)小説(しょうせつ) (science fiction)
  • 空想(くうそう)世界(せかい) (fantasy world)
  • 空想(くうそう)() (dreamer, fantasist)

Related terms:

  • 想像(そうぞう) (imagination - more general)
  • 妄想(もうそう) (delusion - more negative)
  • ファンタジー (fantasy - loanword)
  • 夢想(むそう) (reverie, daydream)

Usage note:
空想(くうそう) can be neutral or slightly negative (impractical dreaming), whereas 想像(そうぞう) is neutral.