トラブルtoraburu[2]nakadaka (mid-high)

1. nountrouble; difficulty; problem; quarrel; conflict; dispute; fight
   私はトラブルに巻き込まきこまれた。↗

   I was involved in the trouble.
2. nounfailure (of an engine, machine, computer, etc.); breakdown; malfunction
   我々われわれのコンピューター・システムには最初さいしょ若干じゃっかんのトラブルがあったが、今いまは全部ぜんぶ解決かいけつされている。↗

   Initially we had some problems with our computer system, but they've been sorted out now.
3. noun(medical) condition; disorder; problem

• 1.
  Synonym面倒めんどうNeutralHassle or bother, and also looking after someone (「面倒を見る」); トラブル focuses on a problem or dispute that has actually arisen.
• 2.
  SynonymいざこざCasualColloquial for small quarrels and frictions; トラブル is broader and can also mean a breakdown.
• 3.
  Synonym厄介やっかいNeutralDescribes something tricky or troublesome (「厄介な問題」), and also caring for someone or taking them in; トラブル is about a problem that has occurred.
• 4.
  Synonym故障こしょうNeutralA machine breakdown, and by extension a bodily injury; トラブル is broader, covering interpersonal disputes too.
• 5.
  Synonym揉め事もめごとNeutralRefers to disputes and quarrels between people, as in 「揉め事を起こす」. トラブル is broader, covering machine breakdowns as well.
• 6.
  SynonymゴタゴタCasualColloquial mimetic word for a muddle or disputes; トラブル is broader and also covers breakdowns.
• 7.
  Synonym悶着もんちゃくNeutralA dispute or stir, often as 「一悶着ある」; トラブル is broader and also refers to breakdowns.
• 8.
  Synonym厄介事やっかいごとNeutralA thorny, troublesome matter or burden; トラブル stresses that a problem or dispute has arisen.
• 9.
  Synonym揉めもめCasualColloquial noun for a quarrel or dispute; rarely stands alone — everyday speech usually says 「揉め事」.
• 10.
  Related障害しょうがいNeutralAn obstacle or hindrance, also a disability or system failure; トラブル is the more colloquial word.
• 11.
  Related紛争ふんそうWrittenDisputes between opposing sides, from international and labor to land and neighborhood (「国際紛争」); a written term leaning toward news and legal usage.
• 12.
  Related波乱はらんNeutralTurmoil or ups and downs (「波乱含み」「波乱万丈」); トラブル refers to a concrete problem.
• 13.
  Relatedご迷惑ごめいわくFormalHonorific for the trouble you cause someone (「ご迷惑をおかけしました」), mostly in apologies; トラブル is the problem itself.
• 14.
  Related紛擾ふんじょうWrittenA written word for disturbances and disputes, now rarely used; in everyday speech say 「トラブル」 or 「揉め事」.
• 15.
  RelatedもつれNeutralTangled threads, and by extension emotional or relationship entanglements; トラブル is broader.
• 16.
  Antonym平穏へいおんNeutralCalm and free of incidents; the opposite of トラブル in terms of peace versus trouble.
• 17.
  Antonym順調じゅんちょうNeutralProgressing smoothly; the opposite of トラブル in terms of whether things go well.

「トラブル」 covers interpersonal disputes, machine breakdowns and even medical conditions. For quarrels between people say 「揉め事」, or the colloquial 「いざこざ」 and 「ゴタゴタ」; for a broken machine say 「故障」; for large-scale conflict between parties say 「紛争」. 「面倒」 and 「厄介」 stress hassle rather than an actual incident, 「ご迷惑」 is the honorific for trouble caused to others, and 「障害」 means an obstacle or disability. Antonyms: 「順調」 (going smoothly) and 「平穏」 (calm).

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

1. 心配しんぱい、苦労くろう。
2. 内紛ないふん、紛争ふんそう。
3. 故障こしょう。