Partially vs Partly

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

Partially

Top 2,000 (common)C1adverb

Partly

Top 2,000 (common)B2adverb
 PartiallyPartly
Pronunciation🇬🇧 /["/ˈpɑːʃəli/"]/🇺🇸 /["/ˈpɑːrʃəli/"]/🇬🇧 /["/ˈpɑːtli/"]/🇺🇸 /["/ˈpɑːrtli/"]/
MeaningNot completely; a little bit.Not completely; some amount.
ExampleThe road was partially blocked by a fallen tree.The project is partly finished, but we still have a lot of work to do.
RegisterNeutralNeutral
How commonTop 2,000 (common)Top 2,000 (common)
CEFR levelC1B2
Part of speechadverbadverb
Collocationspartially completed, partially responsible, partially understoodpartly cloudy, partly responsible, partly true, partly finished, partly understood
Antonymscompletely, entirely, whollywholly, completely, entirely
Common mistakesConfused with 'participle' due to similar sound., Using 'partially' when 'completely' was intended., Forgetting to use it with a verb or adjective.'Partly' is sometimes confused with 'part' as in the amount., Some learners use 'partly' incorrectly with a noun instead of an adjective., Mistakenly using 'partly' in place of 'mostly' or 'mainly'.
Usage notesUse this word when something is done to some extent but not entirely. It's suitable for academic and everyday contexts but may sound too formal in casual speech.Use 'partly' when you want to describe something that is only true in part. It’s appropriate in both spoken and written English, but avoid using it in overly formal contexts.

Frequently asked questions: Partially vs Partly

What's the difference between Partially and Partly?

Partially: Not completely; a little bit. Partly: Not completely; some amount.

Are Partially and Partly the same CEFR level?

Partially: C1, Partly: B2 on the CEFR scale.

Can I use Partially and Partly interchangeably?

Not always. Partially and Partly 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.

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