(もうそう)

もうそう
noun / suru-verb
delusion, wild fantasy
1. delusion, delusional thinking (clinical)
Fixed false beliefs held despite evidence to the contrary, used in psychiatric contexts.
被害(ひがい)妄想(もうそう)(なや)まされている。
They are troubled by paranoid delusions.
2. fantasy, daydream, wild imagination
Fanciful or unrealistic thoughts or imaginings, often used playfully.
また妄想(もうそう)(はじ)まった。
There they go with their fantasies again.
彼女(かのじょ)妄想(もうそう)世界(せかい)(ひた)っている。
She's immersed in her fantasy world.
妄想(もうそう)(ふく)らませる。
Let one's imagination run wild.

FORMATION: (もう) (reckless/wild) + (そう) (thought).

COMMON TYPES (Sense 1):

  • 被害(ひがい)妄想(もうそう) (paranoid delusion, persecution complex)
  • 誇大(こだい)妄想(もうそう) (delusions of grandeur)
  • 関係(かんけい)妄想(もうそう) (delusion of reference)

CAUSAL USAGE (Sense 2):
In everyday speech, 妄想(もうそう) is often used lightheartedly to describe daydreaming or unrealistic hopes, especially in otaku and internet culture.

COMMON COLLOCATIONS:

  • 妄想(もうそう)する (to fantasize)
  • 妄想(もうそう)(ふく)らませる (let imagination run wild)
  • 妄想(もうそう)(ぐせ) (tendency to fantasize)