si·lent 
(sīlənt)
(sīlənt)adj.
1. Marked by absence of noise or sound; still: the silent forest. See Synonyms at quiet.
2.
a. Not inclined to speak; not talkative: He's the strong, silent type.
b. Not speaking or refraining from speech: Do be silent.
c. Not saying anything about a particular matter; making no mention: The poem is silent on the reason for the speaker's sadness.
3.
a. Not voiced or expressed; unspoken: a silent curse; silent consent.
b. Having no spoken dialogue and usually no soundtrack. Used of a film.
4. Linguistics Having no phonetic value; unpronounced: the silent b in subtle.
5. Inactive; quiescent: a silent volcano.
6. Producing no detectable signs or symptoms: a silent heart attack.
n.
A silent movie.
[Latin silēns, silent-, present participle of silēre, to be silent.]
silent·ly adv.
silent·ness n.