Roget's Thesaurus

#571. Obscurity

Nouns

obscurity etc. (unintelligibility) 519; involution; hard words; ambiguity etc. 520; unintelligibleness; vagueness etc. 475, inexactness etc. 495; what d'ye call 'em etc. (neologism) 563; darkness of meaning.

Adjectives

obscure etc. n.; crabbed, involved, confused.