非ひ公こう開かい

noun which may take the genitive case particle 'no', noun

private; non-public; closed

Describes something not open to the public, such as meetings, events, data, or facilities. Often used in formal or official contexts.

• その会かい議ぎは非ひ公こう開かいで行おこなわれた。

  The meeting was held behind closed doors.