活気|かっきkakki[0]heiban (flat)

1. nounenergy; vigour; vigor; liveliness; spirit; life; animation
   その街まちは活気かっきにあふれていた。↗

   The town was full of activity.

• Synonym生気せいきWrittenWritten/formal prose. Points to visible life and vitality, often in a person's expression, as in 「生気のない顔」; 活気 describes the bustle of a place or crowd.
• Synonym元気げんきNeutralNeutral. Covers good spirits and health in people, animals, even towns; 活気 is about the lively, thriving atmosphere of a place or crowd rather than one's condition.
• Synonym活力かつりょくNeutralNeutral. The inner power that fuels activity, as in 「経済の活力」; more abstract than 活気, which paints the bustle of a scene.
• Related精力せいりょくNeutralNeutral. Physical and mental energy of an individual, as in 「精力的に働く」; 活気 is a lively mood around you, not one person's stamina.
• Related生命力せいめいりょくNeutralNeutral. The power to stay alive, as in 「雑草の生命力」; centred on survival, where 活気 is about lively, bustling activity.
• RelatedバイタリティNeutralNeutral loanword for vitality and drive, said mostly of people; 活気 suits places and crowds.
• Related気迫きはくNeutralNeutral. Fearless spirit or presence that bears down on others, as in 「気迫に押される」; strength of mind, not a lively scene.
• Related意気いきWrittenWritten/formal prose. Fighting spirit or drive, seen mostly in set phrases like 「意気込み」 and 「意気投合」.
• Related気勢きせいWrittenWritten/formal prose. Momentum or drive, often of a group's mood, as in 「気勢を上げる」; 活気 is the lively atmosphere itself.
• RelatedエナジーNeutralNeutral loanword for energy, mostly in product names; in everyday speech the word is 「エネルギー」.
• Related気力きりょくNeutralNeutral. Mental strength to persevere, as in 「気力が尽きる」; willpower rather than the outward liveliness of 活気.
• Related精気せいきWrittenWritten/formal prose. Vital spirit or life essence; rare in modern Japanese, unlike the everyday liveliness of 活気.
• Related血気けっきWrittenWritten/formal prose. Youthful ardour and dash, as in 「血気盛ん」, with a hint of impulsiveness that 活気 lacks.
• Related精根せいこんWrittenWritten/formal prose. Energy plus endurance, mostly in 「精根尽きる」; an individual's reserves, not the bustle of a place.
• Related活動力かつどうりょくNeutralNeutral. The capacity to act and keep going; stresses ability to move, while 活気 stresses a lively, bustling mood.
• Antonym沈滞ちんたいWrittenWritten/formal prose antonym: stagnation and gloom, as in 「沈滞ムード」; the very state that 活気 dispels.
• Antonym無気力むきりょくNeutralNeutral antonym: listless and without drive, said mostly of people; the human side of a scene lacking 活気.
• Antonym不活発ふかっぱつWrittenWritten/formal prose antonym: inactive and sluggish; the direct opposite of a place or activity full of 活気.

Use 「活気」 for the lively, thriving atmosphere of a place, event or crowd. For a person's spirits or health say 「元気」; for inner power that fuels activity 「活力」; for one's physical and mental energy 「精力」; for the will to keep going 「気力」. 「生気」 (written) suits visible life in a face; 「精気」, 「意気」, 「気勢」, 「血気」 and 「精根」 are written words for spirit or drive; 「バイタリティ」 and 「エナジー」 are loanwords, the latter mostly in product names. Antonyms: 「不活発」 and 「沈滞」 for dull, stagnant scenes, 「無気力」 for listless people.

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

1. 生き生いきいきとした気分きぶん。