Casual vs Informal vs Relaxed

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

Casual

Top 2,000 (common)B2adjective

Informal

InformalTop 2,000 (common)A2adjective

Relaxed

Top 1,000 (very common)B1adjective
Most common: Relaxed
 CasualInformalRelaxed
Pronunciation🇬🇧 //ˈkæʒ.əl//🇺🇸 //ˈkæʒ.uəl//🇬🇧 /["/ɪnˈfɔːml/"]/🇺🇸 /["/ɪnˈfɔːrml/"]/🇬🇧 /["/rɪˈlækst/"]/🇺🇸 /["/rɪˈlækst/"]/
MeaningSomething relaxed or informal.Casual or relaxed; not formal.not feeling stress; calm and comfortable
ExampleShe wore a casual dress to the picnic.His informal style of writing makes the articles more enjoyable to read.After a long week at work, I finally felt relaxed during the weekend.
RegisterNeutralInformalNeutral
How commonTop 2,000 (common)Top 2,000 (common)Top 1,000 (very common)
CEFR levelB2A2B1
Part of speechadjectiveadjectiveadjective
Collocationscasual clothes, casual conversation, casual relationshipbe, become, remain, extremely, fairly, very, be, become, remain, extremely, fairly, very, be, become, remain, extremely, fairly, veryappear, be, feel, extremely, fairly, very, about
Antonymsformal, seriousformal, serious, ceremonialstressed, tense, anxious
Common mistakesConfused with 'informal' – they have similar meanings but may not be interchangeable., Using 'casual' in overly formal situations., Misunderstanding the context – 'casual' often refers to behavior or appearance.Confuse with 'formality' which relates to being formal., Use in a formal letter or business context., Assume it only applies to speech, ignoring written context.Using it to describe something too intense or serious., Confusing with 'relaxing', which describes an activity., Saying 'more relaxed' when you should use 'less tense'.
Usage notesUse 'casual' to describe informal settings or clothing. Avoid in formal contexts.Used in casual conversations, texts, or social media. Avoid in formal writing or professional settings.Typically used to describe a person's mood or atmosphere. Can be informal when used in casual conversations, but acceptable in more formal contexts as well.

Frequently asked questions: Casual vs Informal vs Relaxed

What's the difference between Casual, Informal, and Relaxed?

Casual: Something relaxed or informal. Informal: Casual or relaxed; not formal. Relaxed: not feeling stress; calm and comfortable

Which is more common: Casual, Informal, and Relaxed?

Relaxed is the most common in everyday English.

Which is more advanced: Casual, Informal, and Relaxed?

Casual is the highest level, at B2, on the CEFR scale.

Are Casual, Informal, and Relaxed the same CEFR level?

Casual: B2, Informal: A2, Relaxed: B1 on the CEFR scale.

What part of speech are Casual, Informal, and Relaxed?

Casual: adjective, Informal: adjective, Relaxed: adjective.

Can you show an example of each?

Casual: She wore a casual dress to the picnic. Informal: His informal style of writing makes the articles more enjoyable to read. Relaxed: After a long week at work, I finally felt relaxed during the weekend.

Can I use Casual, Informal, and Relaxed interchangeably?

Not always. Casual, Informal, and Relaxed 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.