Attempting to define C is often considered "not useful." One preference amongst the "not useful" crowd is to replace C by tapping into ideas within words that can be verified. As an example "aware." "If I poke it with a stick, will it react." If it does react then safe to say "it's aware." If it doesn't react then safe to say "it's not aware," or possibly "dead." And of course there are much subtler ways of testing "aware" than the stick poking test.
As well there are subset words that can be arranged around "aware" all of which
while being qualities of "aware" cleave to an hierarchy of "awareness." In
the PWMQ shift, this ladder if awareness is W, rather than M. And if you
happen to be thinking about stuff don't fall for the often quoted idea that
Descartes dismissed the world of other creatures as being without 'awareness.' If you want to know why, he was looking to M for his definition of
psychology, and the consequence of his thinking about life lacked Charm.