不通|ふつうfutsuu[0]heiban (flat)

1. nounsuspension; interruption; stoppage; tie-up; cessation
   電話でんわは不通ふつうなの。↗

   The phones aren't working.

• Antonym通じるつうじるNeutralAntonym in the open-vs-blocked sense, neutral in register: 「通じる」 describes roads or lines being open and connected, and also ideas getting through or being understood.
• Antonym開通かいつうNeutralAntonym in the open-vs-blocked sense, neutral in register: 「開通」 is the opening of a new road, railway or phone line, or the resumption of service after an interruption.

Use 「不通」 for traffic or communication being cut off, as in 「音信不通」 or 「全線不通」. Its antonyms are 「開通」, for a new line opening or service resuming, and 「通じる」, for roads and lines being open and for ideas getting through.

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

1. 交通こうつうや通信つうしんができないこと。また、音信おんしんがないこと。
2. その分野ぶんやに通つうじていないこと。
3. 縁えんを切きること。