gloomy (and dark) adj.: tenebrous

[In 1944, Alfred Kazin wrote an article] that will live long in the annals of that tenebrous time [i.e. the era of Nazi Germany]. “In Every Voice, in Every Ban” was a cry of outrage at the suicide of Shmuel Ziegelboim, the representative of the Bund who killed himself in London to protest the world’s indifference to the extermination of the Jews. (Author not given, Alfred Kazin, The New Republic, 06/29/1998.)