useful

If you can use something, it's useful. Useful things are handy for whatever you're doing.

If something is just what you need or you just find it helpful, then it's useful. A hammer is useful in building many things. Coasters are useful if you don't want a coffee table to get stains. College degrees are useful — or necessary — for many careers. MacGyver would tell you that just about anything can be useful at some point: it all depends what you need to do.

Definitions of useful
  1. adjective
    having a useful function
    synonyms: utilitarian
    functional
    designed for or capable of a particular function or use
  2. adjective
    being of use or service
    “the girl felt motherly and useful”
    “a useful job”
    “a useful member of society”
    synonyms: utile
    effective, effectual, efficacious
    producing or capable of producing an intended result or having a striking effect
    expedient
    serving to promote your interest
    helpful
    providing assistance or serving a useful function
    profitable
    yielding material gain or profit
    serviceable
    ready for service or able to give long service
    multipurpose
    having multiple uses
    reclaimable, recyclable, reusable
    capable of being used again
    serviceable
    capable of being put to good use
    usable, useable
    capable of being put to use
    utilitarian
    having utility often to the exclusion of values
    utilizable
    capable of being put to a profitable or practical use
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    Antonyms:
    useless
    having no beneficial use or incapable of functioning usefully
    ineffective, ineffectual, uneffective
    not producing an intended effect
    unprofitable
    producing little or no profit or gain
    unserviceable
    not ready for service
    futile, ineffectual, otiose, unavailing
    producing no result or effect
    inutile
    not worth using
    unserviceable, unusable, unuseable
    not capable of being used
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