有益|ゆうえきyuueki[0]heiban (flat)

1. na-adjective, nounbeneficial; profitable; useful; helpful; instructive
   私にはとても有益ゆうえきだった。↗

   It was of great benefit to me.

• Synonym役立つやくだつNeutralA verb meaning to come in handy or serve a purpose. 「有益」 is a na-adjective stressing benefit to people or society, and leans toward written style.
• Synonym有利ゆうりNeutralSays conditions favor you, you hold the advantage, or it makes money. 「有益」 stresses that something does good, without comparing who is better off.
• Synonym有用ゆうようWrittenWritten-style word for useful or usable, as in 「有用な資源」. 「有益」 puts more weight on doing good and benefiting people.
• Synonym得とくNeutralRefers to gaining a benefit or getting a good deal, as in 「得をする」. 「有益」 centers on doing good, not on coming out ahead.
• Synonym有意義ゆういぎNeutralMeans meaningful or worthwhile, as in 「有意義な時間」. 「有益」 stresses that something brings concrete benefit.
• Synonym助けになるたすけになるCasualA colloquial phrase for being helpful to someone. Close to 「有益」 in meaning but much more conversational.
• Synonym割のいいわりのいいCasualColloquial for little effort in and much money back — lucrative work or deals. 「有益」 says nothing about the ratio of input to return.
• Related実用的じつようてきNeutralDescribes things that work well in actual use, mostly objects. 「有益」 typically describes information, experience, or activities that benefit people.
• Related重宝ちょうほうNeutralSays a thing is handy and gets constant use, as in 「重宝している」. 「有益」 is more literary and speaks of content being beneficial.
• Related便宜べんぎWrittenWritten word for convenience or expediency, as in 「便宜を図る」. 「有益」 is about bringing actual benefit.
• Related良いよいNeutralThe most general word for good, and can cover beneficial. 「有益」 specifically means useful or beneficial and is more formal.
• Related効果的こうかてきNeutralMeans visibly effective, as in 「効果的な方法」. 「有益」 stresses that something does good, not how strong the effect is.
• RelatedプラスNeutralLiterally the plus sign or addition, but colloquially a plus factor, as in 「プラスになる」. 「有益」 is the more formal choice.
• RelatedゲインNeutralLoanword for gain, whether profit or electronic signal gain; rare in daily talk. To say something is beneficial, use 「有益」 or 「得」.
• RelatedためNeutralIn the set phrase 「ためになる」 it means beneficial or instructive. 「有益」 is the formal, written counterpart.
• Related好都合こうつごうNeutralSays the timing or conditions are just right and convenient, as in 「好都合だ」. 「有益」 is about bringing real benefit.
• Related便利べんりNeutralMeans convenient and easy to use, said mostly of tools and transport. 「有益」 is said of information and activities that benefit people.
• Related益えきNeutralAn adverb meaning more and more. Not actually a synonym of 「有益」 — the two merely share the character 「益」.
• Related調法ちょうほうNeutralAn alternative spelling of 「重宝」, seen less often; it means handy and practical, but 「重宝」 is the usual form in everyday use.
• Antonym無益むえきWrittenWritten-style antonym meaning useless or futile, as in 「無益な争い」 — the direct opposite of 「有益」.
• Antonym有害ゆうがいNeutralAntonym meaning harmful, as in 「有害物質」 — the direct opposite of 「有益」.

Use 「有益」 in written or formal style to say something benefits people. In everyday speech, say 「役に立つ」 or 「ためになる」 instead. For things that are handy or convenient, pick 「便利」 or 「重宝」; for being at an advantage, 「有利」; for a meaningful, worthwhile experience, 「有意義」. Watch out for 「益々」, which is an adverb, not a synonym.

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

1. 利益りえきのあること。役立やくだつこと。