熱血|ねっけつnekketsu[0]heiban (flat)

1. nounhot blood; warm blood
2. nounzeal; fervor; fervour; ardor; ardour; enthusiasm

• Synonym情熱じょうねつNeutralPassion and zeal; the most broadly used of these words, as in 「情熱を注ぐ」.
• Synonym熱情ねつじょうWrittenWritten/formal prose for blazing emotion; close to 「情熱」 but more literary.
• Related熱気ねっきNeutralRefers to heat or hot air, and to the heated atmosphere of a place, as in 「会場の熱気」; 「熱血」 centers on a person's burning zeal.
• Related熱心ねっしんNeutralDescribes earnest, devoted effort, as in 「熱心な学生」; 「熱血」 is more impassioned and has a youthful ring.
• Related熱意ねついNeutralEnthusiasm and sincerity, as in 「熱意を示す」; 「熱血」 is stronger and more openly displayed.
• Related激情げきじょうWrittenWritten/formal prose for intense emotion that can be positive or negative, such as anger; 「熱血」 centers on burning zeal.
• Related熱狂ねっきょうNeutralFrenzy — excitement to the point of madness, said mostly of audiences and fans; 「熱血」 is burning zeal and also fits 「熱血指導」「熱血ドラマ」.
• Related熱烈ねつれつNeutralArdent or fervent, as in 「熱烈な歓迎」; it stresses an attitude shown outwardly.
• Related熱中ねっちゅうNeutralBeing fully absorbed in something, as in 「勉強に熱中する」; 「熱血」 stresses impassioned zeal.
• Related血気けっきWrittenWritten/formal prose for hot-blooded impulsiveness, as in 「血気盛ん」; it carries a shade of recklessness.
• Antonym冷静れいせいNeutralCalm and composed, not letting emotion take over; the opposite of the fiery fervor of 「熱血」.
• Antonym無関心むかんしんNeutralApathy, indifference — the opposite of the burning enthusiasm of 「熱血」.
• Antonym冷血れいけつNeutralCold-hearted, devoid of human warmth — the opposite of the warm zeal of 「熱血」.

For passion in general, say 「情熱」 or 「熱意」. 「熱血」 is for burning zeal charged with a sense of justice and youthful spirit, as in 「熱血教師」. Use 「熱気」 for a heated atmosphere, 「熱狂」 for fan frenzy, 「熱中」 for absorption in something, 「熱烈」 for an ardent welcome, 「熱心」 for earnest effort, and 「冷静」 for staying cool; 「冷血」 and 「無関心」 express coldness and indifference.

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

1. 熱あつい血潮ちしお。
2. 血ちが沸き立わきたつほど熱烈ねつれつなこと。