How to say "energy" in Japanese

Choosing the right word
  • エネルギーJLPT N3approx.Common
    nounThe loanword is the default for energy in the physical and scientific sense — electricity, fuel, calories — and is also used for a person's drive and get-up-and-go.
    熱ねつはエネルギーの一種いっしゅである。↗
    Heat is a form of energy.
  • 活気かっきJLPT N3approx.Common
    nounCovers energy as liveliness or bustle — a lively street, market or office has this. It points to the animated atmosphere of a place or group, not a person's bodily energy.
    その街まちは活気かっきにあふれていた。↗
    The town was full of activity.
  • 精力せいりょくCommon
    nounA person's energy and vitality, physical and mental, especially as something spent on work or activity; an energetic, vigorous person has plenty of it.
    彼女かのじょはその仕事しごとに精力せいりょくを傾かたむけた。↗
    She addressed herself to the task.
  • nounBodily staying power — the physical energy to keep going without wearing out. Use it when talking about tiring, endurance or recovering one's strength.
  • 気力きりょくCommon
    nounEnergy as willpower: the mental drive to get up and do something. Say someone lacks this when they feel too listless or discouraged to even start.
    雨あめのために彼かれらは気力きりょくをそがれた。↗
    The rain dampened their spirits.

Use 「エネルギー」 for physical or scientific energy, 精力 and 「スタミナ」 for bodily vigor and stamina, 気力 for the mental will to act, and 活気 for lively energy in a place or crowd.

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

Japanese equivalents
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JLPT vocabulary levels are community estimates, not official (no official lists have been published since the 2010 revision).

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