bare bones
1. noun The essential and most elementary parts of something; a general outline or summary. Please don't go through each line item in the budget—just give me the bare bones.
2. adjective Minimally furnished or adorned. The apartment is pretty bare bones, but rent is cheap, and I don't spend much time there, so I don't mind.
bare-bones
Cliché limited; stripped down; lacking refinements or extras. This one is the bare-bones model. It has no accessories at all.