insensibility
From LSJ
ἆρά γε λόγον ἔχει δυοῖν ἀρχαῖν, ὑλικῆς τε καὶ δραστικῆς → does it in fact have the function of two principles, the material and the active?
subs.
P. ἀναισθησία, ἡ, τὸ ἀναίσθητον, ἀναλγησία, ἡ. Inconsiderateness: P. ἀγνωμοσύνη, ἡ. Numbness: Ar. and P. νάρκη, ἡ.