Princeton's WordNet

1. useful, utile(adj)

   being of use or service

   "the girl felt motherly and useful"; "a useful job"; "a useful member of society"

2. utilitarian, useful(adj)

   having a useful function

   "utilitarian steel tables"

Kernerman English Learner's Dictionary

1. useful(adjective)ˈyus fəl

   ≠ useless

   a useful tool; The extra money would be useful.; Could I be useful to you?; ways to spend your time usefully; a discussion about the usefulness of the safety measures

Wiktionary

1. useful(Adjective)

   Having a practical or beneficial use.

   This tool is very useful. It makes doing this task a lot easier.

Webster Dictionary

1. Useful(adj)

   full of use, advantage, or profit; producing, or having power to produce, good; serviceable for any end or object; helpful toward advancing any purpose; beneficial; profitable; advantageous; as, vessels and instruments useful in a family; books useful for improvement; useful knowledge; useful arts

• nuttigAfrikaans
• مُفيد، نافِعArabic
• полезенBulgarian
• útilPortuguese (BR)
• užitečnýCzech
• nützlichGerman
• nyttigDanish
• χρήσιμοςGreek
• útilSpanish
• kasulikEstonian
• سودمندFarsi
• hyödyllinenFinnish
• utileFrench
• מוֹעִילHebrew
• उपयोगीHindi
• koristanCroatian
• hasznosHungarian
• bergunaIndonesian
• gagnlegur, nytsamlegurIcelandic
• utileItalian
• 役に立つJapanese
• 유용한Korean
• naudingasLithuanian
• []derīgsLatvian
• bergunaMalay
• nuttigDutch
• nyttig, til nytte; (gjøre) nytte for segNorwegian
• użytecznyPolish
• سودمندPersian
• ګټور، دكار، دګټې، په كار راتلونى: مرستونى، كومكىPashto
• útilPortuguese
• folositorRomanian
• полезныйRussian
• užitočnýSlovak
• koristenSlovenian
• koristanSerbian
• användbar, nyttigSwedish
• ที่มีประโยชน์Thai
• yararlı, faydalıTurkish
• 有用的Chinese (Trad.)
• корисний, придатнийUkrainian
• مفيدUrdu
• hữu dụngVietnamese
• 有用的Chinese (Simp.)