安静 — meaning in English

ān jìng

English meaning

calm adj Free from anxiety, agitation, or strong emotion; peaceful.
doldrums noun (usually 'the doldrums') A feeling of low mood, boredom or lack of energy.
meek adj Quiet, humble, and unwilling to assert oneself.
quiet adj Making little or no sound.
quietly adv In a manner that makes little noise or draws little attention.
silence noun Complete absence of sound.
silently adverb Without making any sound.
soft adj Giving way easily under pressure; not hard or firm.
softly adverb In a gentle or quiet way; without force or loudness.
tacit adjective Understood or agreed without being said aloud or written down.
tranquil adj Calm and peaceful; free from disturbance.

安静 is used for these senses in English:

calm (meteorology) The absense of wind; a period of time without wind.
doldrums (nautical) Usually preceded by the: the state of a sailing ship when it is impeded by calms or light, baffling winds, and is unable to make progress.
meek Humble, non-boastful, modest, meager, or self-effacing.
quiet With little or no sound; free of disturbing noise.
quietly In a quiet manner.
silence The absence of any sound.
silently In a silent manner; making no noise.
softly Not loudly; nearly inaudibly.

noun (usually 'the doldrums') A feeling of low mood, boredom or lack of energy.
noun (usually 'the doldrums') The condition of a sailing ship stuck because there is too little wind to move it.
noun Usually used with 'the': a region of the sea close to the equator known for calm spells, sudden squalls, and light, shifting winds.