informal

adjective

in·​for·​mal (ˌ)in-ˈfȯr-məl 

1

: marked by the absence of formality or ceremony

an informal meeting

2

: characteristic of or appropriate to ordinary, casual, or familiar use

informal clothes

informality

(ˌ)in-(ˌ)fȯr-ˈma-lə-tē 

-fər-

noun

informally

(ˌ)in-ˈfȯr-mə-lē 

adverb

Synonyms of informal

• unconventional

Examples of informal in a Sentence

We had an informal meeting over lunch.

He has an informal manner that puts people at ease.

He spoke to them in informal Spanish.

The term is common in informal contexts.

He took an informal poll among his coworkers.

Recent Examples on the Web

That blend of formal and informal science made the confirmation possible. —Hanna Wickes, Charlotte Observer, 9 Mar. 2026

The handsome Lieutenant Portuondo (Adam Poss) regularly stops by for inspections as part of his military duties, but his growing attraction to Maria Celia soon leads to more informal encounters. —Emily McClanathan, Chicago Tribune, 9 Mar. 2026

Wholesale delivery driving for Guida’s Dairy was my first real job, one that wasn’t an informal non-paying family thing, or me as some kid down the street cutting grass. —Jody Mamone, Hartford Courant, 8 Mar. 2026

There are strong ties among residents, extensive social networks, informal social control. —Andre Mouchard, Oc Register, 8 Mar. 2026

Word History

First Known Use

15th century, in the meaning defined at sense 1

Rhymes for informal

• abnormal
• conformal
• lognormal
• nonformal
• subnormal
• formal
• formyl
• orthonormal
• paranormal
• supernormal

Kids Definition

informal

adjective

in·​for·​mal (ˈ)in-ˈfȯr-məl 

1

: not formal

an informal party

2

: suited for ordinary or everyday use

informal clothes

informality

ˌin-(ˌ)fȯr-ˈmal-ət-ē 

-fər-

noun

informally

(ˈ)in-ˈfȯr-mə-lē 

adverb

Legal Definition

informal

adjective

in·​for·​mal

: marked by the absence of required forms or procedures or by the relaxation of prescribed rules

an informal hearing