quietened

Reduced the noise

Quietened is the past tense of quieten, meaning to make or become quiet.

The word is primarily British; American English prefers quieted: The crowd quietened as the speaker approached.

It applies to sounds, people, or abstract things like fears or doubts: Her reassurances quietened his anxieties.

silenced

suppressed

Forcibly held down

quelled · muzzled · repressed · squelched · clamped · hushed · shut-up · stopped · curtailed · checked

peaceful

tranquil

Calm and untroubled

restful · soothing · undisturbed · reposeful · harmonious · meditative · untroubled · composed · pacific · relaxed

hushed

whispered

Spoke without full voice

lowered · breathy · muffled · softened · dampened · gentle · subdued · toned-down · understated · piano

Opposites
volume/noise level

quietenedamplified

Increased in strength

loudened · blared · blasted · cranked up · turned up

activity/energy level

quietenedenlivened

Made more spirited

animated · invigorated · energized · wakened · awakened

emotional/psychological state

quietenedagitated

Emotionally disturbed, restless

stirred · excited · aroused · roused · disturbed

Phrases
Family

quieten, quietening, quietens

Familiarity
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Timeless · Everyday, not technical · Rated G