無風|むふうmufuu[0]heiban (flat)

1. no-adjectivewindless; calm; no-wind
2. no-adjectivequiet (state of affairs); peaceful; stable; safe (electoral seat)

• Synonym静穏せいおんWrittenCalm and stable; used mostly of the sea or a situation, and can also describe weak or no wind. Written/formal prose.
• Synonym静謐せいひつWrittenQuiet, tranquil serenity; can also describe a world at peace. Highly literary.
• Related平穏へいおんNeutralSafe and uneventful, as in 「平穏な日々」; centers on everyday life going smoothly. Neutral in register.
• Related平静へいせいNeutralCalm of mind or of a scene; stresses composure and not letting feelings show. Neutral in register.
• Related沈静ちんせいNeutralCommotion or market activity settling down; stresses the shift from motion to stillness. Neutral in register.
• AntonymあらしNeutralAntonym: a storm, also figuratively an uproar or turmoil; the direct opposite of windless 「無風」.

Use 「無風」 for no wind, or for an election or situation with no waves, as in 「無風状態」「無風選挙区」. For safe, uneventful daily life pick 「平穏」; for a calm, stable situation in formal prose pick 「静穏」; 「嵐」 is the antonym.

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

1. 風かぜが吹ふいていないこと。
2. 波乱はらんがなく、平穏へいおんなこと。