静か・閑か|しずかshizuka[1]atamadaka (head-high)

1. na-adjectivequiet; silent
   キャプテンは静しずかにするように命めいじた。↗

   The captain commanded silence.
2. na-adjectiveslow; unhurried
3. na-adjectivecalm; peaceful

• Synonym静寂せいじゃくWrittenA noun for total, enveloping silence, as in 「静寂に包まれる」. More literary than 「静か」 and stronger — silence so complete it fills everything.
• Synonym静粛せいしゅくWrittenHushed, orderly silence in a setting, typically called for in announcements like 「ご静粛に願います」; also describes machines or vehicles that run without loud noise.
• Synonym静穏せいおんWrittenWritten style for calm surroundings, seas or situations, as in 「静穏な海」. 「静か」 stresses few sounds; this stresses overall stillness and stability.
• Synonym平穏へいおんWrittenPeaceful in the sense that nothing happens — no trouble or upheaval, as in 「平穏な日々」. Focuses on an uneventful state rather than low noise.
• Synonym平静へいせいWrittenCalm as a state of mind — composure after upset — or a settled situation, as in 「平静を装う」. Centers on one's mental state.
• Synonym安穏あんのんWrittenLiving in ease and security, free of worries; can carry a mild negative shade of being complacent with the status quo.
• Synonym穏やかおだやかNeutralGentle rather than silent: mild personalities, weather or seas, as in 「穏やかな人」. The emphasis is softness, not the absence of sound.
• Synonym閑静かんせいWrittenDescribes quiet surroundings, especially neighborhoods, as in 「閑静な住宅街」. A favorite of property listings.
• Synonym物静かものしずかNeutralFor people who are quiet and composed in demeanor, as in 「物静かな人」. Mostly describes a person's character rather than a place or scene.
• Synonym落ち着いたおちついたNeutralComposed and unflustered for people, or subdued and mellow for colors and interiors, as in 「落ち着いた色」.
• Synonym安らかやすらかWrittenPeace free of worry or danger, as in 「安らかに眠る」. Also the standard word in condolences for the departed.
• SynonymのどかNeutralLeisurely, idyllic peace of rural scenery, as in 「のどかな田舎」. Stresses relaxed ease rather than quietness itself.
• Synonym粛然しゅくぜんWrittenSolemn, reverent quiet that makes people hush, as in 「粛然とした空気」. Carries a sense of awe that 「静か」 lacks.
• Synonym密やかひそやかWrittenEither soundless and hushed, or done in secret so no one notices, as in 「ひそやかな恋」. The secretive use adds a covert shade that 「静か」 lacks.
• Synonym閑寂かんじゃくWrittenLiterary word for a lonely, secluded stillness with a wistful beauty; found in literature and tea ceremony contexts.
• Synonym寂静じゃくじょうWrittenWritten word for a settled, tranquil mind; also a Buddhist term, as in 「涅槃寂静」.
• Synonym静謐せいひつWrittenLiterary and elegant tranquility, as in 「静謐な空間」. Gives places a refined, hushed beauty that 「静か」 does not.
• Synonym寧静ねいせいWrittenA rare, literary word for a calm, settled state of mind. You will almost never need it in speech.
• RelatedのどやかWrittenA literary variant of 「のどか」 with the same pastoral, leisurely peace, but more elegant in tone.
• Antonym騒がしいさわがしいNeutralThe direct opposite of 「静か」: noisy and clamorous, and by extension turbulent times or an unsettled world.
• Antonym喧騒けんそうWrittenThe written-style antonym: the din and bustle of crowds, as in 「都会の喧騒」. Evokes busy city life.

For plain quiet, 「静か」 is the default. Use 「静寂」 for total silence, 「静粛」 to hush a hall, 「閑静」 for quiet neighborhoods, 「物静か」 for reserved people, 「平穏」 for uneventful days, and 「穏やか」 for gentle people or weather. Most others are literary shades of tranquility; 「騒がしい」 and 「喧騒」 are the noisy opposites.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 音おとがない、又または音おとが少すくなく、ひっそりとしているさま。
2. 動うごきが少すくなく落ち着おちついたさま。