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Cynical nay-saying, or one who cynically nay-says. Seeing only the bad, with little to no hope for a good outcome. Gloomy Gus.

Etymological cousins, one might say, rather than siblings, of ‘pejorative’ and - go know - ‘pejorate’.

Pejorative can be visited here. That's what made me think to suggest pessimism. That and it being how I view much of the world these days.