Silent

безмълвен

bezmǎlven

(not speaking; indisposed to talk; speechless; mute; taciturn)

безсимптомен

bezsimptomen

(undiagnosed or undetected because of an absence of symptoms)

безшумен

bezšumen

(free from sound or noise; absolutely still; perfectly quiet)

заглушен

zaglušen

(in silent mode, on silent, with the sound turned off)

непроизносим

neproiznosim

(not pronounced; having no sound; quiescent)

ням

njam

(without audio capability)

тих

tih

(free from sound or noise; absolutely still; perfectly quiet)