Find Antonyms

informal Antonyms

Opposite of informal

Because the opposite of informal shifts with each meaning, the 9 antonyms and opposite words below are separated across 3 exact definitions and ranked by contrast strength.
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• adjective (Context 1)

Having a relaxed, friendly, or unofficial style, manner, or nature; not bound by strict rules or ceremonies.

Usage Example

"The team held an formal meeting over coffee to brainstorm ideas for the upcoming project."

Strongest
formal
official
Strong
ceremonious
stiff
formalized

• adjective (Context 2)

Denoting the grammatical structures, vocabulary, and idiom suitable for everyday conversation rather than official or academic contexts.

Usage Example

"Contractions and slang are common features of formal spoken English."

Strongest
formal
Strong
literary
academic

• adjective (Context 3)

(of clothing) Suitable for everyday wear rather than formal or ceremonial occasions.

Usage Example

"Guests were encouraged to wear formal attire to the outdoor summer barbecue."

Strongest
formal
dressy
Strong
black-tie

Similar words to informal

Words similar to informal shift depending on context. Common synonyms include:

colloquial
casual
conversational
relaxed
unofficial
everyday
vernacular
unceremonious
See all synonyms of informal

• Nearby Words

influx
info
inform
informal
informality
informally
information

Cite this Entry

Wordmom. (2026). Antonyms for Informal. In Wordmom Thesaurus. Retrieved Nov 5, 2026, from https://wordmom.com/antonyms/informal
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