エナジーenajii

1. nounenergy

• SynonymバイタリティNeutralA loanword for robust vitality and drive, used mainly of people; it has none of 「エナジー」's energy or energy-source senses.
• Synonym活力かつりょくNeutralThe motive power of activity or life; said of people, economies and organizations, as in 「活力を取り戻す」. More common than 「エナジー」.
• Synonym気力きりょくNeutralThe willpower to see things through hardship, as in 「気力が尽きる」; mental in focus, not bodily or physical energy.
• Synonym精力せいりょくNeutralThe stamina for getting things done, as in 「精力的に働く」; also has a sexual-vigor sense; not physical energy.
• SynonymエネルギーNeutralThe most general word for energy and vigor; it also covers physical energy and power sources, while 「エナジー」 is mostly for product names and ads.
• Synonym生気せいきNeutralVitality as it shows on the outside — in the face, voice or movements, as in 「生気のない顔」.
• Related活気かっきNeutralA lively, bustling atmosphere, as in 「活気のある街」; mostly describes places and groups, not physical energy.
• Related元気げんきNeutralGood spirits and good health; the most common everyday word, focused on a person's physical and mental state; not used for physical energy.
• Related意気いきNeutralAn eager, positive spirit or mettle, seen in 「意気込み」 and 「意気投合」; the emphasis is on resolve.
• Related気勢きせいNeutralSurging momentum, as in 「気勢を上げる」; usually a group's drive, not an individual's energy.
• Related力ちからNeutralStrength or ability in the broadest range of uses, as in 「力を出す」; not specifically vigor or energy.
• Related血気けっきNeutralHot-blooded youthful vigor, as in 「血気盛んな若者」; carries an impulsive tinge 「エナジー」 lacks.
• Related精気せいきWrittenA written word for a person's vital spark, as in 「精気がない」; the life force that sustains body and mind.
• Related精根せいこんNeutralStamina plus perseverance, often in 「精根尽きる」; stresses spending all one's heart and energy.
• Related活動力かつどうりょくWrittenWritten and little used; the drive to get things done and keep at it, stressing capacity for action.
• Antonym無気力むきりょくNeutralAntonym: listlessness, having no drive at all; the opposite of the energetic 「エナジー」.
• Antonym倦怠けんたいNeutralAntonym: weariness or boredom, as in 「倦怠感」; the opposite of being full of energy.

「エナジー」 is mostly seen in product names and advertising, as in 「エナジードリンク」. For energy in general say 「エネルギー」, and for feeling fit and lively say 「元気」. Among the near-synonyms, 「活力」 is the driving force of people, economies and groups, 「精力」 personal stamina, 「気力」 willpower, 「活気」 the bustle of a place, and 「生気」 visible liveliness. 「無気力」 and 「倦怠」 stand for the opposites, listlessness and weariness.

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

1. エネルギー。