IPA: /ɪˈnænɪmətnəs/
KK: /ɪˈnænɪmətnəs/
The quality or state of being not alive or lacking the ability to move or act.
The inanimateness of the rocks made them seem lifeless and unchanging.
Inanimateness → It is formed from "in-" (meaning not) and "animus" (from Latin, meaning spirit or life) and the suffix "-ness" (meaning the state of being). The word describes the state of being without life or spirit, hence inanimate.
Think of 'not having life' ('in-') and 'spirit' ('animus') to remember that 'inanimateness' refers to the state of being lifeless.