Efficient or effective?
Efficient and effective are adjectives. We use efficient to describe something or someone that works in a quick and organised way: The new online banking system offers a convenient and efficient way to check your account.
[extract from a reference for someone applying for a job] I have always known James to be highly competent and efficient in all aspects of his job.
We use effective to describe something that gives you the results you want: Taking this tablet is a very effective cure for travel sickness.
In this light, the camera is more effective if you use the flash.
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