Persistent vs Sustained

When to use each in English, with meaning, register, and examples.

Persistent

Top 2,000 (common)C1adjective

Sustained

Top 2,000 (common)
 PersistentSustained
Pronunciation🇬🇧 /["/pəˈsɪstənt/"]/🇺🇸 /["/pərˈsɪstənt/"]/🇬🇧 //səˈsteɪnd//🇺🇸 //səˈsteɪnd//
MeaningContinuing to do something despite difficulties.Kept going for a long time without stopping.
ExampleShe showed persistent effort in completing the project despite numerous obstacles.The athlete achieved a sustained effort throughout the race.
RegisterNeutralNeutral
How commonTop 2,000 (common)Top 2,000 (common)
CEFR levelC1-
Part of speechadjective
Collocationsbe, extremely, incredibly, really, be, extremely, incredibly, reallysustained effort, sustained attention, sustained growth, sustained period, sustained increase
Antonymstemporary, yielding, intermittentinterrupted, discontinued, temporary
Common mistakesConfusing with 'consistant' which means something different., Using 'persistent' in a positive context only; it can also refer to annoying behavior., Mispronouncing the word, especially the 's' sound.Confused with 'sustaining,' which implies the act of maintaining., Incorrectly used as a synonym for 'sustenance' which refers to food or nourishment.
Usage notesUse 'persistent' in texts where determination or refusing to give up is highlighted. It's more appropriate in formal or neutral contexts, while not commonly used in casual conversation.Used in formal contexts, especially in science or discussions about health. Avoid in casual conversations about small, everyday tasks.

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Persistent
Sustained

Frequently asked questions: Persistent vs Sustained

What's the difference between Persistent and Sustained?

Persistent: Continuing to do something despite difficulties. Sustained: Kept going for a long time without stopping.

Can you show an example of each?

Persistent: She showed persistent effort in completing the project despite numerous obstacles. Sustained: The athlete achieved a sustained effort throughout the race.

Can I use Persistent and Sustained interchangeably?

Not always. Persistent and Sustained are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.