弊害|へいがいheigai[0]heiban (flat)

1. nounharmful effect; harmful influence; evil practice; abuse; malady
   喫煙きつえんは体からだに弊害へいがいである。↗

   Smoking has an ill effect upon health.

• Synonym害悪がいあくWrittenWritten/formal prose. Refers to evil influences that harm society; 「弊害」 covers the side effects and negative consequences of a practice or system.
• Synonym害がいNeutralNeutral. A broad word for harm or damage, as in 「健康に害がある」; 「弊害」 is the negative effects that accompany something.
• Synonym禍害かがいWrittenWritten/formal prose and rare. A scourge or bane; in everyday speech use 「災い」 or 「害」 instead.
• Synonym害毒がいどくWrittenWritten/formal prose. Something that poisons mind, body, or public morals; 「弊害」 leans toward the side effects of systems and institutions.
• Related危害きがいNeutralNeutral. Harm that endangers life or safety; 「弊害」 is the ill effects a system or practice brings.
• Related惨禍さんかWrittenWritten/formal prose. A horrific calamity caused by war or disaster; 「弊害」 is the ill effects that come with a practice or system.
• Related損害そんがいNeutralNeutral. Concrete losses such as money or property; 「弊害」 refers to adverse effects and drawbacks.
• Related傷害しょうがいWrittenA legal term for inflicting bodily injury; quite distinct from 「弊害」.
• Related損傷そんしょうNeutralNeutral. Physical damage to objects or the body; 「弊害」 is an abstract negative effect.
• Related不都合ふつごうNeutralNeutral. Inconvenience or impropriety; 「弊害」 is negative effects that have arisen or may arise.
• Related毀損きそんWrittenWritten/formal prose. Damaging property or harming someone's reputation; 「弊害」 means drawbacks.
• RelatedダメージNeutralNeutral loanword for a blow or damage, common in colloquial speech; 「弊害」 is a written-style word for drawbacks and side effects.
• Related厄難やくなんWrittenWritten/formal prose and rare. A calamity or stroke of misfortune; the everyday word is 「災難」.
• Related毀傷きしょうWrittenWritten/formal prose and rare. Damage or injury; the everyday word is 「損傷」.
• Antonym利益りえきNeutralNeutral. Benefits, profits, or gains — the opposite of 「弊害」.
• Antonym利点りてんNeutralNeutral. Advantages or merits, set against the drawbacks of 「弊害」, as in 「利点と弊害」.

Use 「弊害」 for the side effects or drawbacks a system or practice produces. For harm in general pick 「害」, for danger to life or safety 「危害」, for concrete losses like money 「損害」, and for damage in casual speech 「ダメージ」; for the opposite idea use 「利点」.

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

1. 自おのずから他ほかに悪影響あくえいきょうを与あたえるようなもの。
2. 悪わるい結果けっか。悪影響あくえいきょう。