Tenebrious is an adjective that means dark, shadowy, or gloomy. There are many synonyms for tenebrious, including murky, dim, obscure, dusky, and somber. Other words that have a similar meaning are shadowed, shady, dimmed, sunless, opaque, and shaded. Tenebrous can also be associated with a sense of foreboding or mystery, and for this reason, it can be paired with words like ominous, eerie, spooky, or sinister. Using synonyms for tenebrious or any word allows the writer to add variety to their language and make their writing more interesting and engaging.