露天|ろてんroten[0]heiban (flat)

1. no-adjectiveopen air

• Synonym屋外おくがいNeutralNeutral term for anywhere outside a building, as in 「屋外プール」; works in both speech and writing. Unlike 「露天」, it does not stress the lack of a roof overhead.
• Synonym野外やがいNeutralNeutral word for the outdoors, especially open country and nature, as in 「野外活動」. 「露天」 stresses being uncovered by a roof rather than the natural setting.
• Synonym戸外こがいWrittenWritten/formal term for the outdoors beyond the home, as in 「戸外で遊ぶ」. 「露天」 focuses on the roofless state itself.
• Synonym野天のてんWrittenA written, old-fashioned word close to 「露天」, as in 「野天風呂」; rarely used now — say 「露天」 instead.
• Synonym室外しつがいNeutralNeutral word for outside a room or building, as in 「室外機」. 「露天」 stresses being directly open to the sky with no roof.
• RelatedおんもCasualColloquial child's word for outside, as in 「おんもへ行こう」, typically said by adults to small children. In ordinary contexts use 「外」 or 「屋外」.
• Antonym屋内おくないNeutralNeutral antonym: inside a building, as in 「屋内プール」 — the opposite of roofless 「露天」.
• Antonym室内しつないNeutralNeutral antonym: inside a room, the opposite of uncovered 「露天」; the most common everyday word for indoors.

Use 「露天」 for places with no roof, open directly to the sky, as in 「露天風呂」 and 「露天掘り」. For anywhere outside a building say 「屋外」, for open country and nature 「野外」. The opposites are 「屋内」 and 「室内」.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 屋根やねの無ない所ところ。