informal
adjective/ĩfuɾˈmal/high
in·for·mal
Definition
Not following official or established rules or conventions; relaxed.
The work environment is very informal. | He used informal language when talking with friends.
Common collocations
informal languageinformal meetinginformal attire
Etymology
Do latim 'informalis', de 'in-' (não) + 'formalis' (formal).