精|せいsei[1]atamadaka (head-high)

1. nounspirit; sprite; nymph
2. nounenergy; vigor (vigour); strength
3. nounfine details
4. nounsemen

• SynonymスピリットNeutralRefers to spirit and morale, and also strong distilled liquor. 「精」 centers on energy or sprites, as in 「精を出す」 and 「森の精」.
• Synonym活力かつりょくNeutralVitality of individuals, society, or the economy, as in 「経済の活力」. In the energy sense 「精」 applies only to people and mostly in set phrases.
• RelatedバイタリティNeutralDescribes a person's abundant vitality and drive, often used to praise someone. 「精」 mostly appears in set phrases like 「精を出す」 and 「精がつく」.
• Related魂たましいNeutralThe soul that dwells in the body, or a person's spirit and grit. 「精」 means energy, or sprites of plants and mountains, not a person's soul.
• Related元気げんきNeutralThe everyday word for being healthy and full of spirit. 「精」 appears mostly in 「精がつく」 and 「精を出す」, meaning physical energy.
• Related霊れいNeutralSame word, also written 「霊」 or 「魄」; it also covers willpower and drive, as in 「魂を込める」. 「精」 centers on energy or sprites.
• Related活気かっきNeutralLiveliness of a scene, group, or person, as in 「町に活気がある」. 「精」 refers to energy itself.
• Related気力きりょくNeutralMental strength to endure hardship and see things through; leans toward willpower. 「精」 means energy, seen in 「精を出す」 and 「精がつく」.
• Related気勢きせいWrittenIn formal prose, the high-spirited momentum of a person or group, often in 「気勢を上げる」 and 「気勢をそがれる」. 「精」 is energy within the body.
• Related精力せいりょくNeutralSame energy sense as 「精」 but used freely on its own, and it can also mean sexual vigor. 「精」 is mostly confined to set phrases.
• Related生気せいきWrittenIn formal prose, the liveliness a person or thing shows outwardly, as in 「生気のない顔」. 「精」 is inner energy, not a look or expression.
• Related霊魂れいこんWrittenA formal, religious-philosophical term for the soul that survives the body. 「精」 never refers to a person's soul.
• Related心霊しんれいNeutralUsed in paranormal and supernatural talk, as in 「心霊写真」. In its sprite sense 「精」 refers to spirits of plants and nature, not ghosts.
• RelatedエネルギーNeutralCovers physical energy and energy resources as well as human drive. Close to 「精」 in the stamina sense, but 「精」 sticks to set phrases.
• Related力ちからNeutralThe broadest word for strength and ability. It matches 「精」 only in the sense of physical energy, as in 「力がつく」 versus 「精がつく」.
• RelatedエナジーNeutralAn English-style reading of 「エネルギー」, seen mostly in product names and advertising. Say 「エネルギー」 or 「精力」 in ordinary speech.
• Related意気いきWrittenIn formal prose, a go-getting, aggressive spirit, often in 「意気込む」 and 「意気投合」. 「精」 is about physical energy, not fighting spirit.
• Related精霊せいれいWrittenA written-style word for spirits of the dead or spirits dwelling in nature. For sprites 「精」 usually appears as 「森の精」, closer to a fairy-tale fairy.
• Related血気けっきWrittenA written word for the impetuous vigor of youth, often in 「血気盛ん」. 「精」 is plain energy, with no hint of rashness.
• Related精気せいきWrittenA philosophical, written word for the vital force that generates all things or sustains body and mind. 「精」 is more colloquial, as in 「精をつける」.
• Related精根せいこんWrittenIn formal prose, energy plus perseverance, often in 「精根尽き果てる」 and 「精根を傾ける」. 「精」 has the parallel saying 「精も根も尽きる」.
• Related神気しんきWrittenAn archaic-sounding word for mind and spirit, or a divine aura. For everyday mental state, 「気力」 or 「精神」 is the usual choice.
• Related活動力かつどうりょくWrittenA formal, explanatory term for the capacity to keep acting. 「精」 means energy and is common in 「精を出す」.

For everyday 'full of spirit' use 「元気」; for energy or stamina use 「精力」 or 「活力」. 「精」 itself mostly appears in set phrases like 「精を出す」 and 「精がつく」, or as a sprite in 「森の精」. For the soul, use 「魂」.

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

1. （セイ）混じり気まじりけの無ないこと。
2. （セイ）精力せいりょく。
3. （セイ）努力どりょく。尽力じんりょく。
4. （セイ）主おもに人間にんげん以外いがいに宿やどる魂たましい。精霊せいれい。
5. （セイ）精液せいえき。
6. （セイ）細こまかく行いき渡わたっているさま。
7. （セイ）まじりけのない純粋じゅんすいなさま。
8. （セイ）最もっともすぐれたさま。えりすぐりのさま。
9. （セイ）力ちからをつくして努力どりょくするさま。