課題|かだいkadai[0]heiban (flat)

1. nounsubject; theme; issue; matter
   その学生がくせいは自分じぶんの課題かだいに専念せんねんした。↗

   The student concentrated on his subject.
2. nounhomework; assignment
   私はとうとうこの課題かだいを終おえた。↗

   At last, I finished this homework.
3. nounproblem (that needs solving); task; challenge; question
4. nounroute (in climbing, bouldering, etc.); problem

• Synonym問題もんだいNeutralThe most versatile word: test questions, troubles, social issues. 「課題」 stresses a task or question that has been set and still awaits a solution or completion.
• Synonym案件あんけんWrittenA concrete matter awaiting discussion or handling, or a court case; common in business and legal writing. 「課題」 stresses a difficulty to be overcome.
• Synonym主題しゅだいNeutralThe central idea of a work or discussion, or a musical theme. 「課題」 is an assigned topic or a problem awaiting solution.
• Synonym宿題しゅくだいNeutralHomework, or figuratively a matter left unresolved. 「課題」 can also mean an assignment, but its range is wider, covering research topics and pending problems.
• Synonym題だいNeutralThe title of a work or lecture, a test question, or a counter for questions. 「課題」 stresses a task that must be completed or solved.
• Synonym命題めいだいWrittenA proposition in logic, or a major goal one must achieve. 「課題」 is more concrete and everyday, with wider use.
• SynonymタスクNeutralA loanword for a concrete task with a deadline, at home in IT and project management. 「課題」 stresses a problem awaiting solution and suits both school and work.
• Related設問せつもんWrittenQuestions set on a test paper; also used as a verb, 「設問する」. 「課題」 is a task to complete or a problem to solve.
• Related勤めつとめNeutralDuties one is expected to fulfill, or holding a job at a workplace. 「課題」 points to problems awaiting solution, not everyday duties.
• Related任務にんむNeutralA duty or mission assigned to you, such as military, police or diplomatic missions. 「課題」 stresses a difficulty to be overcome.
• Related問いといNeutralA question you put to someone, stressing the act of asking. 「課題」 focuses on something to be solved or completed.
• Related面倒めんどうNeutralTrouble or bother — something that takes effort and gets on your nerves; very common in speech. 「課題」 is a problem to be solved, with no sense of annoyance.
• Related任にんWrittenA responsibility one bears, mostly in set phrases like 「任に当たる」 or 「任が重い」. 「課題」 stresses a problem awaiting solution.
• Related作業さぎょうNeutralHands-on work or an operation carried out step by step, as in 「作業員」. 「課題」 stresses a problem to be solved.
• Related仕事しごとNeutralWork or a job in the broadest sense, including one's assigned duties. 「課題」 stresses a difficulty to tackle or a topic that has been set.
• Relatedお勤めおつとめNeutralYour work or occupation, or chanting sutras before a Buddha statue. 「課題」 focuses on problems to be solved; the two are rarely interchangeable.
• Relatedお役目おやくめNeutralAn official duty or role assigned to you, with a solemn tone. 「課題」 stresses a problem awaiting solution.
• RelatedプロブレムNeutralA loanword for 'problem', rarely used on its own in daily speech — say 「問題」 instead. 「課題」 stresses a task that must be solved.

Use 「課題」 for a problem set for you to solve, an assignment, or a research topic, as in 「今後の課題」. For problems in general say 「問題」, for homework 「宿題」, and for a concrete matter to be handled or a court case 「案件」. 「主題」 is a theme, 「任務」 a mission, 「仕事」 work, 「タスク」 a deadline-bound task, and 「面倒」 a bother; the rest cover test questions, duties or set phrases and rarely replace 「課題」.

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

1. 仕事しごとや勉強べんきょうの題目だいもく。
2. 解決かいけつを求もとめられる問題もんだい。