Crossword Genius

Portentously gloomy (6)

Ross

I believe the answer is:

gothic

(Other definitions for gothic that I've seen before include "Of architecture with flying buttresses, for example" , "See 6 ac" , "Medieval architecture style" , "Lurid - style of European architecture" , "Building style of medieval cathedrals" .)

I've seen this clue in The Times.
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