意欲・意慾|いよくiyoku[1]atamadaka (head-high)

1. nounwill; desire; eagerness; interest; drive; motivation; urge; ambition
   その老人ろうじんは生いきる意欲いよくをなくした。↗

   The old man lost the will to live.

• Synonym意気込みいきごみNeutralA noun for the drive and momentum you put into something, as in 「意気込みを語る」; it focuses on the energy of the moment.
• Synonym熱意ねついNeutralA noun for eager, wholehearted commitment, as in 「熱意が伝わる」; it stresses the intensity of feeling more than 「意欲」 does.
• Related熱心ねっしんNeutralDescribes earnest, devoted involvement, as in 「熱心な学生」; it is about one's attitude toward an activity.
• Related野心やしんNeutralA noun for a grand ambition held secretly, often pejorative; also the drive to break new ground in art. 「意欲」 is just the willingness to do something.
• Related野望やぼうWrittenWritten-style word for a grand ambition, usually negative, as in 「天下統一の野望」.
• Related大志たいしWrittenWritten-style word for lofty ambition with a positive tone, as in 「少年よ大志を抱け」.
• Related情熱じょうねつNeutralA noun for passion, as in 「情熱を注ぐ」; the feeling is more intense than with 「意欲」.
• Related熱狂ねっきょうNeutralA noun for frenzy or wild excitement, as in 「熱狂的なファン」; it is about surging emotion, not the willingness to act.
• Related大望たいもうWrittenA written-style word for a grand aspiration; it carries an old-fashioned, literary flavor.
• RelatedアンビションNeutralA loanword for ambition or high aspirations; uncommon in everyday Japanese.
• Antonym無気力むきりょくNeutralA noun for listlessness, having no energy or drive; the opposite of 「意欲」.
• Antonym消極的しょうきょくてきNeutralAn antonym: passive and unassertive, the opposite of the proactive stance of 「意欲」.

Use 「意欲」 for the drive or willingness to do something, as in 「学習意欲」. Pick 「意気込み」 for a burst of energy in the moment, 「熱心」 for a devoted attitude, 「熱意」 for fervent commitment, and 「情熱」 for intense passion. For ambition, 「大志」 is positive, 「野心」 often negative, 「野望」 negative and formal, 「大望」 literary. 「熱狂」 is frenzy, not motivation; the antonyms are 「無気力」 and 「消極的」.

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

1. ある物事ものごとをしたいと思おもう気持きもち。モチベーション。