秘ひ中ちゅうひちゅうMeanings1nounin secret; secretly; confidentiallyUsed to indicate that something is done or kept hidden from others. Often appears in formal or written contexts.その計けい画かくは秘ひ中ちゅうに進すすめられた。The plan was carried out in secret.Expressions秘ひ中ちゅうの秘ひtop secret; most confidential