The thing about "unalive" is that I personally use it to tone down and make light of my depression and things similar. I might also use it as a joke when referring to some type of media.
Unalive is a silly word and shouldn't be used in serious context.
The problem I have with "unalive" is that its so fucking swagless at least in cartoons when they were told to tone it down for the kiddos and couldnt use kill and hell they used destroy and shadow realm or whatever but unalive???? 0 effort 0 cool its an embarrassment