(n.) The quality of being inaudible; inaudibleness.

Egyptian darkness Erebus awful silence blackness dark darkness darkness visible dead deathlike silence golden silence hush hush of night inaudibility intense darkness lightlessness lucid stillness lull midnight moonlessness mum night noiselessness noonday night obscure obscure darkness obscurity peace pitch-darkness pitchy darkness quiescence quiet quietness quietude rest silence silentness solemn silence soundlessness starlessness still stillness sunlessness swarthiness tacitness taciturnity tenebrosity tenebrousness the palpable obscure tomblike silence total darkness tranquillity velvet darkness whisht