silent
Pronunciation: /ˈsʌɪlənt/
adjective
- not making or accompanied by any sound: the wood was still and silent
- (of a person) not speaking: she fell silent for a moment
- not expressed aloud: a silent prayer
- (of a letter) written but not pronounced, e.g. b in doubt: a silent ‘h’
- (of a film) without an accompanying soundtrack: she appeared in a number of silent films
- saying or recording nothing on a particular subject: the poems are silent on the question of marriage
- (of a person) not prone to speak much; taciturn: I’m the strong, silent type

Phrases
-
(as) silent as the grave
- see grave1.
-
the silent majority
- the majority of people, regarded as holding moderate opinions but rarely expressing them: it is vital to get the silent majority to stand up and be counted
-
the silent treatment
- a stubborn refusal to talk to someone, especially after a recent argument or disagreement: often bosses ignore workers or give them the silent treatment

Origin:
late 15th century (in the sense 'not speaking'): from Latin silent- 'being silent', from the verb silere