もうもう

taru-adjective, adverb taking the 'to' particle

dense; thick; heavy

Describes thick fog, smoke, dust, or similar obscuring conditions. Often used with と (もうもうと) as an adverb.

• 工こう事じ現げん場ばは砂すな埃ぼこりでもうもうとしていた。

  The construction site was thick with dust.

• 濃のう霧むがもうもうと立たちこめ、視し界かいが悪わるかった。

  Dense fog hung heavily, and visibility was poor.

taru-adjective, adverb taking the 'to' particle

dim; vague; hazy

Used for mental states where thinking is unclear or consciousness is foggy, often from fatigue, illness, or intoxication.

• 熱ねつで頭あたまがもうもうとして、考かんがえがまとまらない。

  My head feels hazy from the fever, and I can't think straight.