ETYM Latin mutus; cf. Greek myein to shut, Skr. muta bound, muka dumb: cf. Old Eng. muet, from French muet, a dim. of Old Fren. mu, Latin mutus.
1. Expressed without speech; especially because words would be inappropriate or inadequate; SYN. tongueless, unspoken, wordless.
2. Lacking power of speech; SYN. tongueless.

Making no sound.

1. Free of noise or uproar; or making little if any sound.
2. Characterized by an absence or near absence of agitation or activity.
3. Not showy or obtrusive; SYN. restrained.
4. (Astronomy; of the sun) Characterized by a low level of surface phenomena like sun spots e.g.

ETYM Latin silens, -entis, p. pr. of silere to be silent; akin to Goth. ana-silan.
1. Marked by absence of sound; SYN. soundless, still.
2. Having a frequency below or above the range of human audibility.
3. Not made to sound; SYN. unsounded.
4. (Of film) Having no spoken dialogue and usually no soundtrack.

1. Free from noticeable current
2. Not sparkling; SYN. noneffervescent.
3. Used of pictures; of a single or static photograph not presented so as to create the illusion of motion; or representing objects not capable of motion

ETYM Latin taciturnus: cf. French taciturne. Related to Tacit.
Habitually reserved and uncommunicative.

Device in the exhaust system of automobiles and motorbikes. Gases leave the engine at supersonic speeds. The exhaust system and muffler are designed to slow them down, thereby silencing them.
Some mufflers use baffle plates (plates with holes, which disrupt the airflow): others use perforated tubes and an expansion box (a large chamber that slows down airflow).

(North American muffler) Device in the exhaust system of automobiles and motorbikes. Gases leave the engine at supersonic speeds, and the exhaust system and silencer are designed to slow them down, thereby silencing them.
Some silencers use baffle plates (plates with holes, which disrupt the airflow), others use perforated tubes and an expansion box (a large chamber that slows down airflow).A device inserted in the exhaust system that is designed to reduce noise; SYN. muffler.