declinist

noun

1. A subscriber to declinism.

   “Rather than accept this, declinists often explained things that did not happen, with explanations that did not work, based on bad history. Thus declinists insist that British R&D has always been low, the City always over-mighty, the country always in the grip of empire, the state under the imaginative control of classicists and historians rather than technocrats, that industry never stood a chance.”

adj

1. Believing in or tending towards declinism.

   “Against a background of almost paralytic gloom and declinist talk, Vienna tried to take on Napoleon, breifly bhecked him at Aspern-Essling and then went down to absolute defeat at Wagram […].”

   “As our first declinist candidate for president, Donald J Trump did at least express something new and true about the nature of our country.”