The antonyms for "furnish with light" would be dark, shade, or dim. When something is furnished with light, it implies that it is bright, visible, and illuminated. However, when something is dark, it lacks light and is thus obscure and hidden. When something is shaded, there may be some light, but it is obstructed, casting shadows and creating an uneven distribution of light. Lastly, when something is dim, it is neither bright nor completely dark, but rather partially illuminated, creating an atmosphere of inconspicuousness. In summary, the antonyms for "furnish with light" suggest a lack or a limitation of light, resulting in various degrees of obscurity.