ふつう不通futsuu
1.

A state in which communication or transportation is severed, causing a complete inability to connect or reach a destination.

2.

A situation where understanding is absent, resulting in an inability to grasp the meaning of something.

3.

The lack of relationships or communication with others, often indicating estrangement or disconnection.

4.

An absence of proficiency or knowledge in a particular subject, suggesting a failure to comprehend or engage with complex ideas.

Example:

電話は不通なの。

おんしんふつう音信不通onshinfutsuuいんしんふつう音信不通inshinfutsuu
1.

A state of having no means of communication or contact, characterized by a complete absence of correspondence or visits.

2.

The condition where individuals or parties are no longer in touch, resulting in silence and a lack of updates from one another.

3.

An interruption in communication, often leading to uncertainty about the well-being or whereabouts of the other party.

Example:

4年以上も音信不通だったんだよ。