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1. Marked by absence of noise or sound; still: the silent forest. See Synonyms at quiet.
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.
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.
A silent movie.

[Latin silēns, silent-, present participle of silēre, to be silent.]

si′lent·ly adv.
si′lent·ness n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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Strange, above all, thy length of tress, And this all solemn silentness!
The rock shone bright, the kirk no less, That stands above the rock: The moonlight steeped in silentness The steady weathercock.
silentness. No stupid ideas, no words of comfort I should not or not