Adverse vs Hostile

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

Adverse

FormalTop 2,000 (common)C1adjective

Hostile

Top 3,000 (common)C1adjective
Most formal: AdverseMost common: Adverse
 AdverseHostile
Pronunciation🇬🇧 /["/ˈædvɜːs//ədˈvɜːs/"]/🇺🇸 /["/ədˈvɜːrs//ˈædvɜːrs/"]/🇬🇧 /["/ˈhɒstaɪl/"]/🇺🇸 /["/ˈhɑːstl//ˈhɑːstaɪl/"]/
MeaningSomething that is harmful or unlucky.Unfriendly or angry.
Example**adverse change/circumstances/weather conditions**The hostile environment made it difficult for the team to complete their mission.
RegisterFormalNeutral
How commonTop 2,000 (common)Top 3,000 (common)
CEFR levelC1C1
Part of speechadjectiveadjective
Collocationsadverse conditions, adverse effects, adverse reactionappear, be, feel, bitterly, decidedly, deeply, to, towards/​toward, appear, be, feel, bitterly, decidedly, deeply, to, towards/​toward
Antonymsfavorable, advantageousfriendly, welcoming, peaceful
Common mistakesConfused with 'inverse', which means opposite., Used inappropriately in informal contexts where 'bad' or 'negative' may suffice.Confused with 'hostility', which is the noun form., Used inappropriately as a synonym for 'negative' in less specific contexts., Incorrectly assumed to only describe acts of violence.
Usage notesOften used in formal contexts, such as reports or analyses. Not typically used in casual conversation. It's important to be clear that 'adverse' indicates a negative outcome.Use 'hostile' to describe people, environments, or situations that are aggressive or unwelcoming. It's more formal than casual terms like 'mean' or 'nasty'. Avoid using it for mild annoyances.

Frequently asked questions: Adverse vs Hostile

What's the difference between Adverse and Hostile?

Adverse: Something that is harmful or unlucky. Hostile: Unfriendly or angry.

Which is more formal: Adverse and Hostile?

Adverse is the most formal of these.

Which is more common: Adverse and Hostile?

Adverse is the most common in everyday English.

Are Adverse and Hostile the same CEFR level?

Adverse: C1, Hostile: C1 on the CEFR scale.

What part of speech are Adverse and Hostile?

Adverse: adjective, Hostile: adjective.

Can you show an example of each?

Adverse: **adverse change/circumstances/weather conditions** Hostile: The hostile environment made it difficult for the team to complete their mission.

Can I use Adverse and Hostile interchangeably?

Not always. Adverse and Hostile 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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