English Thesaurus

Synonyms of 'informal'

(adjective) 
Definition
relaxed and friendly
She is refreshingly informal.
Synonyms
,
relaxed
The atmosphere at lunch was relaxed.
, ,
familiar
the comfortable, familiar atmosphere
,
unofficial
Rail workers have voted to continue their unofficial strike.
,
laid-back
Everyone here has a really laid-back attitude.
,
easy-going
They have a very easy-going attitude to life.
,
colloquial
He converses in colloquial Japanese as easily as in English.
,
unconstrained
,
unceremonious
(adjective) 
Definition
relaxed and friendly
The house has an informal atmosphere.
Synonyms
relaxed
Try to adopt a more relaxed manner.
,
easy
She laughed and joked and made easy conversation with everyone.
,
comfortable
A home should be comfortable and friendly.
, , , ,
cosy
a cosy chat between friends
,
laid-back (informal)
, ,
leisurely
Lunch was a leisurely affair.
,
Opposites
(adjective) 
Definition
appropriate to everyday life or use rather than formal occasions
Most of the time she needs informal clothes.
Synonyms
casual
I bought casual clothes for the weekend.
, , , ,
(adjective) 
an informal meeting of EU ministers
Synonyms
,
irregular
The minister was accused of irregular business practices.
,
unconstrained
,
unceremonious
Opposites

Additional synonyms

in the sense of colloquial
Definition
suitable for informal speech or writing
He converses in colloquial Japanese as easily as in English.
in the sense of comfortable
Definition
giving comfort
A home should be comfortable and friendly.
in the sense of cosy
Definition
intimate and friendly
a cosy chat between friends

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Video: pronunciation of 'informal'

Source

Thesaurus for informal from the Collins English Thesaurus
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