
1) Acheronian 2) Acherontic 3) Dark
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https://www.crosswordclues.com/clue/stygian

1) Dark and forbidding 2) Dark or gloomy 3) Gloomy 4) Greatly gloomy 5) Hellish 6) Infernal
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https://www.crosswordclues.com/clue/stygian

The word Stygian as a synonym usually refers to the River Styx of the underworld Hades. It may also refer to: ...
Found on
http://en.wikipedia.org/wiki/Stygian

having a gloomy or foreboding aspect; murky
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http://phrontistery.info/s.html

• (a.) Of or pertaining to the river Styx; hence, hellish; infernal. See Styx.
Found on
http://thinkexist.com/dictionary/meaning/stygian/
Styg'i·an adjective [ Latin
Stygius , from
Styx ,
Stygis , Greek ..., ..., the Styx.] Of or pertaining to the river Styx; hence, hellish; infernal. See
Styx . « At that so sudden blaze, the
Stygian throng Bent their aspect.»
Milton. Found on
http://www.encyclo.co.uk/webster/S/217

hence dark gloomyÂ
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HMS Stygian was a British Sealion Class submarine of 715 tons displacement launched during the early 1940's. HMS Stygian was armed with one 3-inch gun; one 20 mm anti-aircraft gun; three machine-guns; six 21-inch torpedo tubes in the bow and one external 21 inch torpedo tube. She had a top speed of 14.5 knots surfaced and 10 knots submerged, could ...
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http://www.probertencyclopaedia.com/browse/RSA.HTM

[
adj] - hellish
Found on
http://www.webdictionary.co.uk/definition.php?query=Stygian

Stygian, stygian 1. Of or characteristic of the river Styx and the infernal regions. 2. Pertaining to the river Styx, or, in a wider sense, to the infernal regions of classical mythology.3. Infernal or hellish; dark or gloomy; inviolable. 4. Completely binding, as an oath sworn by the river Styx, which the gods themselves feared to break. 5. Very d...
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http://www.wordinfo.info/words/index/info/view_unit/2660/
adjective hellish; `Hence loathed Melancholy.../In Stygian cave forlorn`- Milton
Found on
https://www.encyclo.co.uk/local/20974

of or pertaining to the river Styx or to Hades. · dark or gloomy. · infernal; hellish.
Found on
https://www.infoplease.com/dictionary/stygian
[Obscure words] dark and dismal as of the river in Hades
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https://www.vocabulary.com/lists/2365341
No exact match found.