1. without a beam or beams; lacking structural beams
Usage: technical/architectural
2. not emitting or reflecting light; dark or dim
Usage: literary or poetic

Examples

• The architect designed a beamless ceiling using advanced cantilever techniques.
• The beamless night sky stretched endlessly above the remote desert.
• Modern construction sometimes employs beamless systems for open floor plans.
• The beamless room felt cavernous and shadowy.
• Engineers tested the beamless structure to ensure it could support the load.