useful

useful — adjective

1. able to help you do something, solve a problem, or achieve a result in an effect

1.adjectiveA2
Definition

able to help you do something, solve a problem, or achieve a result in an effective way — for example, a useful tool, a useful piece of advice, or a useful skill.

Example

A good dictionary is useful when you are learning a new language.

useful + when-clause: describing a situation

Linh found several useful tips for growing vegetables in a small balcony garden.

useful before a noun (attributive)

Common collocations
  • useful information
  • useful advice
  • useful tip
  • useful tool
  • useful skill
  • useful feature
  • useful experience
  • particularly useful
  • extremely useful
  • come in useful
Synonyms
  • helpful

    Can be used for both people and things; more personal and friendly tone.

  • practical

    Emphasises effectiveness in real situations; a practical tool works well for everyday tasks.

  • handy

    Informal; suggests something is convenient and easy to use, often small or portable.

  • valuable

    Stronger than 'useful'; suggests high worth or importance, not just helpfulness.

Antonyms
  • useless

    The most direct opposite; not serving any purpose or achieving any result.

  • pointless

    Emphasises a lack of purpose or reason; suggests effort would be wasted.

Grammar Patterns

useful + for + noun/gerund

useful + to + infinitive

it is useful + to + infinitive

useful + to + person

Usage Note

Can be used both before a noun (a useful gadget) and after a linking verb (this tool is useful). The structure 'it is useful + to-infinitive' is very common for giving advice or suggestions.

Common Mistakes

She is a very useful person in the office.
She is a very helpful person in the office.
'useful' is typically used for objects, tools, or abstract things (advice, information), not for people's helpful character. Use 'helpful' for a person's willingness to assist.

2. still able to be used or to produce good results, especially when describing how

2.adjectiveB2
Definition

still able to be used or to produce good results, especially when describing how long something remains functional or productive — for example, the useful life of a machine, or making yourself useful by doing helpful tasks.

Example

The architect estimated the useful life of the building at fifty years.

collocation: useful life

Defne made herself useful by helping the team pack up chairs after the school concert.

phrase: make oneself useful

Common collocations
  • useful life
  • useful years
  • make yourself useful
  • remaining useful life
Synonyms
  • serviceable

    More technical; suggests something is in good enough condition to be used, often after repairs or wear.

  • functional

    Focuses on whether something works rather than how well it works.

Grammar Patterns

useful + life / years / days

make + oneself + useful

Usage Note

This sense often appears in the fixed expression 'useful life' (the expected period something works properly) and the phrase 'make yourself useful' (a friendly way to ask someone to help).

Idioms

come in useful

idiom

to prove helpful or convenient at some point, often unexpectedly.

That small pocket knife came in useful when we needed to open a package during the picnic.

The extra blankets will come in useful if the temperature drops at night.

Word family

Synonym discussion

Sense: adjective/1

All four words describe something that serves a positive purpose, but they differ in scope and tone. 'Helpful' is the broadest and can describe both people and things (a helpful assistant, helpful advice), whereas 'useful' leans toward objects and abstract items. 'Practical' focuses on real-world effectiveness — a practical solution works in daily life, not just in theory. 'Handy' is informal and suggests something is conveniently easy to use, especially small tools or gadgets. 'Valuable' is the strongest, implying high worth or importance — not just helpful, but deeply beneficial. For example, a pocket multi-tool is handy, whereas knowing first aid is a valuable skill that could save a life.

helpful ↗practical ↗handy ↗valuable ↗

Common collocations

Nouns

  • useful information
  • useful advice
  • useful tip
  • useful tool
  • useful skill
  • useful feature
  • useful experience
  • useful purpose

Adverbs

  • extremely useful
  • particularly useful
  • very useful
  • especially useful
  • always useful
  • quite useful
  • highly useful

Phrases

  • come in useful
  • make yourself useful
  • put something to useful purpose
  • useful life

Prepositions

  • useful for
  • useful to
  • useful in

Etymology

LatinOld EnglishEnglish

Formed from the word 'use' (from Latin 'usus', meaning 'act of using', derived from 'uti' — 'to use') plus the suffix '-ful' (from Old English '-full', meaning 'full of'). The meaning 'serving a purpose, of practical value' emerged in the late 1500s. Before that, the simpler word 'helpful' carried most of this meaning.