The phrase "as glum" is correct and usable in written English.
It can be used to compare someone's mood or expression to being glum, often in a simile or descriptive context.
Example: "After hearing the disappointing news, she looked as glum as a rainy day."
Alternatives: "as gloomy" or "as downcast".
"The Assassination of Jesse James" is nearly as glum as "American Outlaws" is inanely buoyant.
The fact that consumers are purchasing autos, said Ben Herzon, senior economist at Macroeconomic Advisers, "suggests they are not feeling as glum as they are reporting".
They're now 4-1 up in the final set and, despite both looking as glum as octogenarian pessimists, they're finally got their mojo working.
Few superhero movies have a plot summary quite as glum as: "A past-his-prime Logan undertakes a final adventure in the post-apocalyptic future".
Two years after Barack Obama's hope-filled inauguration the mood in Washington is as glum as it has been since Jimmy Carter argued that America was suffering from "malaise".
The Angelenos, as glum as any of their critics, were back at work today and the two palatial hotels that surged with life two nights ago were as quiet as the Egyptian kings.
This might seem like straight-up crazy talk, especially as one of the only things that's actually been confirmed about the next season of Broadchurch is that David Tennant and Olivia Colman will return as glum-cop cufflinks DI Hardy and DS Miller.
Bizarrely, even the short cartoon that's shown before Disney's latest animated epic, Moana, argues that it's fine to spend your days as a corporate drone in a company called Boring, Boring & Glum, as long as you eat pancakes and go swimming at lunchtime.
Mr. Sinise, looking stricken and indignant even before Hathaway accuses Olham of being an evil suicide robot bomber, seems as cold and glum as the world around him.
Last week I whined about the dismal prospect of them getting together for a romantic sub-plot that promised to be as improbable and glum as the one featuring the reporter and eponymous hacker in The Girl with the Dragon Tattoo.
'This summer of ours... is as long and glum as a Russian winter.' Finally, the Sicilian sun made an appearance and I headed for the splendid Zingaro nature reserve, a peninsula of small white sand coves, sculptural rock formations, winding coastal paths and rolling turquoise seas.
