opacity (n.)
- abstruseness
- ambiguity
- asininity
- boorishness
- cloudiness
- crassness
- crudeness
- dark
- darkness
- denseness
- density
- dimness
- dullness
- dumbness
- equivocation
- fog
- fogginess
- fuzziness
- grossness
- hebetude
- impenetrability
- impermeability
- indefiniteness
- indeterminateness
- indistinctness
- lethargy
- mist
- mistiness
- murk
- murkiness
- mystification
- obfuscation
- obscurantism
- obscurity
- obtuseness
- opaqueness
- perplexity
- reconditeness
- roil
- shapelessness
- slowness
- sluggishness
- sottishness
- stolidity
- stupidity
- thickness
- turbidity
- turbidness
- unclearness
- unintelligibility
- vagueness
