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• s  dark and gloomy
  a tenebrous cave

• Occasionally, an Indian name came to his lips, hesitant syllables cascaded to a tenebrous penult: Rabindranath Tagore.
• The most saline of American writers finds himself unable to escape the tenebrous undertow of Jewish mysticism.
• In tenebrous tones Churchill surveyed the Spartan boundaries of Labor's promised land.

• tenebrific
• tenebrious