仇・寇・讐・賊|あだada[2]odaka (tail-high)

1. nounfoe; enemy; rival
2. nounresentment; enmity; grudge
3. nounharm; injury
   せっかくの苦労くろうもあだになった。↗

   All my pains went for nothing.

• Synonym敵てきNeutralThe most general word for an enemy, covering rivals and opponents too; 「仇」 stresses a foe you hold a deep grudge against, as in 「仇を討つ」.
• SynonymエネミーCasualA loanword meaning enemy, heard mostly in games; colloquial, and free of any nuance of a deep blood grudge.
• Synonym仇敵きゅうてきWrittenA sworn, unforgivable enemy; written/formal prose with a strong tone, and the closest of these words to 「仇」.
• Synonym敵手てきしゅWrittenWritten/formal prose for a rival or adversary, also for falling into the enemy's hands as in 「敵手に落ちる」; hatred is not necessarily implied.
• Synonym敵人てきじんWrittenMeans enemy, but is rare even in written prose; it stresses the opposing side rather than any hatred.
• Related恨みうらみNeutralThe grudge or resentment itself, the hatred held in one's heart, not the foe it is borne against.
• Related災いわざわいNeutralA disaster or calamity, often in 「口は災いの元」; it points to misfortune, not to an enemy.
• Related憎しみにくしみNeutralThe emotion of hatred itself; it stresses the feeling, not the person you would take revenge on.
• Related惨禍さんかWrittenA gruesome calamity; written/formal prose stressing how horrific the disaster is.
• Related遺恨いこんWrittenA grudge carried over from the past; written/formal prose stressing a hatred formed long ago.
• Related害悪がいあくWrittenHarm or evil influence in written/formal prose; it stresses damaging effects on society rather than a foe.
• Related凶きょうNeutralIll fortune or a bad omen, used mostly in fortune-telling, as in 「大凶」.
• Related厄やくNeutralBad luck or an unlucky year, with a folk-custom flavor, as in 「厄払い」.
• Related禍まがWrittenAlso written 「禍」; a common written/formal word for calamity or misfortune. It stresses the disaster itself, not an enemy.
• Related怨恨えんこんWrittenEnmity or a grudge in written/formal prose; it stresses hatred buried deep inside.
• Related禍害かがいWrittenA scourge or source of harm; rare even in written prose, stressing the damage something causes.
• Related害毒がいどくWrittenPoisonous harm or a baneful influence, as in 「社会に害毒を流す」; it stresses a corrupting effect.
• Antonym恩人おんじんNeutralA benefactor, the opposite of the 「仇」 you hold a grudge against, as in 「命の恩人」.
• Antonym味方みかたNeutralOne's own side or ally, the opposite of the hostile 「仇」.

Use 「仇」 for a foe you bear a deep grudge against, or for repaying kindness with ingratitude, as in 「親の仇を討つ」 and 「恩を仇で返す」. For an ordinary enemy say 「敵」, for a sworn enemy 「仇敵」, and for the feeling of resentment 「恨み」. The remaining words cover rivals, calamities and grudges in various registers. The opposites of 「仇」 are 「恩人」, a benefactor, and 「味方」, an ally.

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

1. 敵対てきたいする人ひと。対立たいりつする相手あいて。
2. 深ふかい恨うらみや憎にくしみの気持きもち。
3. 危害きがいを加くわえること。損そこなうこと。