英気|えいきeiki[1]atamadaka (head-high)

1. noungreat wisdom; excellent disposition
2. nounstrength (to face something); willpower; vigor; vigour; energy

• Synonym活力かつりょくNeutralThe driving force behind activity; applies to people, organizations, and the economy, as in 「活力を取り戻す」. Far broader in use than 「英気」.
• Synonym気力きりょくNeutralInner strength to endure hardship and see things through, as in 「気力が尽きる」; it stresses perseverance, while 「英気」 stresses energy built up and stored.
• RelatedバイタリティNeutralLoanword for abundant energy and drive, often describing someone's character, as in 「バイタリティあふれる人」; 「英気」 is written/formal, seen in 「英気を養う」.
• Related元気げんきNeutralThe everyday word for good spirits or health, also usable as a na-adjective; 「英気」 is written/formal, energy one stores up, and can also mean outstanding talent.
• Related気迫きはくNeutralUnyielding spirit when facing hardship or an opponent, as in 「気迫に満ちる」; 「英気」 refers to vigor or energy one can store up.

「英気」 is written/formal: vigor one stores up, as in 「英気を養う」, and it can imply outstanding talent. For everyday good spirits or health use 「元気」; for vitality use 「活力」 or 「バイタリティ」; 「気迫」 is unflinching spirit, 「気力」 inner willpower.

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

1. 優すぐれた才気さいき。
2. 活動かつどうしようとする気力きりょく。元気げんき。