The Oxford Thesaurus An A-Z Dictionary of Synonyms - obscurity n.

1) dimness, darkness, gloom, murk, murkiness, duskiness, dusk, blackness, faintness, blurriness, shade, shadow, haze, fog, cloudiness, nebulousness: The two of them vanished into the obscurity of the night. 2) abstruseness, ambiguousness, intricacy, complexity, unintelligibility; mystery, arcanum, secret, esoterica (pl.) : Can he truly believe that he has fathomed all the obscurities of Scripture? 3 insignificance, unimportance, ingloriousness, inconspicuousness, anonymity, namelessness, limbo: After a fleeting surge of popularity, punk rock sank into obscurity.