For blocking light:
* Blinds: These are slats that can be adjusted to control light.
* Shades: These are usually a single piece of material that rolls up or down.
* None: This simply means having no covering at all.
For decorative purposes:
* Bare: This implies a lack of covering or ornamentation.
* Open: This suggests no obstruction, allowing full view.
* Transparent: This describes something that allows light to pass through, like sheer fabric.
For privacy:
* Open: This implies a lack of privacy, as there is nothing to obstruct the view.
* Transparent: This describes something that is easily seen through, offering little privacy.
* Revealing: This suggests something that exposes rather than conceals.
Ultimately, the best antonym for "curtains" depends on the specific context and what aspect of curtains you're trying to oppose.