doomer

/ˈduːmə(ɹ)/

Etymology

From Middle English domere, from Old English dōmere (“judge”), equivalent to doom + -er. The more recent sense was popularized via a meme, “30 Year-Old Boomer”. The derivations of which are other words that end in -oomer, describing various personality types.

noun

One who believes that petroleum depletion will inevitably lead to a severe recession or depression, followed by a Malthusian catastrophe.“Those who suggest the likely return of the four horsemen of the apocalypse (famine, pestilence, war, and death) are more vocal than ever before despite being labeled Malthusian or just "doomer."”
Someone who is apathetic or has a negative prospect towards the world.“Doomers, meanwhile, are the nihilistic cousins of “Bloomers” and “Gloomers,” all three gradients of the same 20-something. Whereas Bloomers are well adjusted and Gloomers are depressed because they are not, Doomers have simply stopped trying. They are no longer pursuing friendships or relationships, and get no joy from anything because they know that the world is coming to an end.”
Someone who is apathetic or has a negative prospect towards the world.; A techno-pessimist, in particular concerning artificial intelligence.“To this day, some doomers work on the inside, nudging the big A.I. labs toward caution, and some work on the outside, arguing that the big A.I. labs should not exist.”
One who, or that which, dooms or pronounces sentence; judge.“Are not the heavens doomers of men's deedes?”
A player of the video game Doom.“Doomers, ranging from children to senior citizens, are up all night hunting specters, imps, and other hellspawn, battling each other in so-called Deathmatch tournaments, and checking out the latest Doom lore by conversing with the game’s developers over computer chat lines. […] What’s ahead for Doomers? Id has authorized a company called Austin Virtual Gaming to license an eight-screen Doom arcade”