Considerable vs Not negligible

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

Considerable

Top 2,000 (common)B2adjective

Not negligible

FormalBeyond 10,000 (less common)
Most formal: Not negligibleMost common: Considerable
 ConsiderableNot negligible
Pronunciation🇬🇧 /["/kənˈsɪdərəbl/"]/🇺🇸 /["/kənˈsɪdərəbl/"]/🇬🇧 //nɒt ˈnɛɡlɪdʒəbl//🇺🇸 //nɑt ˈnɛɡlɪdʒəbl//
MeaningA lot; significant in amount or degree.Not something you can ignore; important.
ExampleThe project wasted a considerable amount of time and money.The effects of climate change are not negligible, affecting ecosystems worldwide.
RegisterNeutralFormal
How commonTop 2,000 (common)Beyond 10,000 (less common)
CEFR levelB2-
Part of speechadjective
Collocationsconsiderable impact, considerable effort, considerable amountnot negligible difference, not negligible impact, not negligible risk, not negligible amount, not negligible evidence
Antonymsinsignificant, minor, inconsequential-
Common mistakesConfused with 'considering' as a verb instead of 'considerable' as an adjective., Using 'considerable' with uncountable nouns only, instead of also with countable., Omitting it when it can emphasize significant amounts.Mixing up with 'negligible' and using it in the wrong context., Using 'not negligible' to describe minor issues., Assuming it can be used without context for clarity.
Usage notesUse 'considerable' when discussing something important or substantial. It's appropriate in both written and spoken language, but avoid using it in very casual contexts.Use 'not negligible' when discussing facts or figures that matter significantly. It's suitable for academic, technical, or formal contexts but may sound overly complex in casual conversation.

See it in real clips

Considerable
Not negligible

Frequently asked questions: Considerable vs Not negligible

What's the difference between Considerable and Not negligible?

Considerable: A lot; significant in amount or degree. Not negligible: Not something you can ignore; important.

Which is more formal: Considerable and Not negligible?

Not negligible is the most formal of these.

Which is more common: Considerable and Not negligible?

Considerable is the most common in everyday English.

Can you show an example of each?

Considerable: The project wasted a considerable amount of time and money. Not negligible: The effects of climate change are not negligible, affecting ecosystems worldwide.

Can I use Considerable and Not negligible interchangeably?

Not always. Considerable and Not negligible 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.

Related comparisons