有用|ゆうようyuuyou[0]heiban (flat)

1. na-adjective, nounuseful; helpful
   鉄てつは最もっとも有用ゆうような金属きんぞくです。↗

   Iron is the most useful metal.

• Synonym役立つやくだつNeutralA verb meaning to serve a purpose; the everyday choice in speech, while 「有用」 is more written and describes inherent usefulness, as in 「有用な情報」.
• Synonym有益ゆうえきWrittenBeneficial; stresses that something brings benefit or gain, as in 「有益な助言」, often with an educational or enlightening flavor. Written/formal.
• Synonym実用的じつようてきNeutralPractical; stresses actual, hands-on usefulness, as in 「実用的なプレゼント」 or 「実用的な知識」.
• Synonym重宝ちょうほうNeutralHandy and treasured; stresses using something often and finding it convenient, as in 「重宝する」.
• Synonym便利べんりNeutralConvenient; very common in daily speech, stressing that something saves trouble.
• Synonym有意義ゆういぎNeutralMeaningful; stresses that an activity or time is worthwhile, as in 「有意義な時間」.
• Synonym助けになるたすけになるNeutralA set phrase meaning to be helpful; colloquial, and focuses on helping a person.
• Related効果的こうかてきNeutralEffective; stresses achieving the intended result, as in 「効果的な方法」.
• Related好都合こうつごうNeutralConvenient or favorable; stresses timing and conditions working in one's favor.
• Related価値あるかちあるNeutralValuable or worthwhile; an expository expression that can modify actions, information, works, and the like.
• Related調法ちょうほうNeutralConvenient and handy; used much like 「重宝」 but rare in modern Japanese.
• Related機能的きのうてきNeutralFunctional; stresses a sensible, easy-to-use design, as in 「機能的なデザイン」.
• Related価値高いかちたかいNeutralValuable; an expository expression covering worth in money, meaning, or function.
• Antonym無用むようWrittenAntonym: useless or unnecessary; the direct opposite of 「有用」, as in 「問答無用」. Written/formal.
• Antonym無益むえきWrittenAntonym: useless and futile; stands opposite both 「有益」 and 「有用」. Written/formal.

「有用」 leans written and describes something as inherently useful, as in 「有用な情報」 or 「有用性」. In speech, 「役立つ」 is the everyday choice; use 「有益」 for bringing benefit, 「実用的」 for practical use, and 「便利」 for convenience. Antonyms: 「無用」, 「無益」.

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

1. 役やくに立たつこと。