limbo¹

n pl -bos

1. (Christian Religious Writings / Theology) (often capital) Christianity the supposed abode of infants dying without baptism and the just who died before Christ

2. an imaginary place for lost, forgotten, or unwanted persons or things

3. an unknown intermediate place or condition between two extremes in limbo

4. a prison or confinement

[from Medieval Latin in limbo on the border (of hell)]