1. An area or room that cannot be practically used for its intended purpose due to design, obstruction, or structural limitations
The attic was considered unusable space because of the low ceiling height.
O sótão era considerado espaço inutilizável por causa da altura baixa do teto.
2. In real estate or architecture, area that does not contribute to functional living or working space
The building had significant unusable space in the corners due to poor planning.
O edifício tinha espaço inutilizável significativo nos cantos devido a um planejamento deficiente.