Something that produces a desired or intended result
Examples:
It is a simple but effective ruse.'The secret to effective time management is.What makes pomodoro so effective?
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Efficient
/ɪˈfɪʃənt/
Working well without wasting time, energy, or resources
Examples:
'Our police force has been very efficient in capturing the murderer.The process proved efficient.Anyway, he was there, swinging a dashed efficient shoe.
Synonyms:
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Ways to tell them apart:
Effective is about doing the right things to achieve a goal.
Efficient is about doing things in a way that consumes the least resources or time.
Think of efficient as being synonymous with optimization, while effective focuses on achieving desired outcomes.
If you are effective, you have achieved your target; if you are efficient, you did it with minimum waste.
Effective does not necessarily mean efficient, and vice versa.