A vocal performance with no instrumental accompaniment.
Singing solely or mainly without instrumental accompaniment.
Related to a form of purely vocal music mostly associated with American college performance groups.
In a manner of a choir with no instrumental accompaniment; literally, "in the style of the (Sistine) Chapel (in Rome)", such as a musical Mass done a cappella.
Having given oneself up to vice; immoral; extremely wicked, or sinning without restraint; irreclaimably wicked.
No longer being acted upon by the geologic forces that formed it.
Free from constraint; uninhibited.
No longer maintained by its former owners, residents, or caretakers; forsaken, deserted.