I was about to object that the latter is not in fact a noun but was surprised to see that wiktionary lists it as such. However it provides no usage examples and I strongly suspect it is in error.
I think it is occasionally used with "the," i.e. "the conscious" (referring to the conscious part of your body, for example). Adjectives sometimes become nouns this way, like "the poor"
I think it is occasionally used with "the," i.e. "the conscious" (referring to the conscious part of your body, for example). Adjectives sometimes become nouns this way, like "the poor"