Nescience means (apparent) absence of Knowledge. For example, stone is Nescient.
Inconscience means (apparent) absence of consciousness. There is no example of it, but creation is supposed to have emerged from a state of utter darkness wherein there is nothing, – neither knowledge, nor power, nor bliss, not even a stir. In the Vedas, it is called as prakritem salilam.
Affectionately,
Alok Da
[Inconscience, Ignorance and Nescience: https://incarnateword.in/compilations/sri-aurobindo-on-psychic-being/inconscience-ignorance-and-nescience]
