Not limited to one single style, form, or standard; breaking away from convention or rigid rules

(idiom) to not be punctilious; to be unconcerned with minor details or trivialities of daily life

to be careless about small matters of conduct or behavior

free and easy; natural; relaxed; not stiff or formal in manner

to not be restricted by formalities or conventions; to not adhere rigidly to rules

wanton and unrestrained; dissolute; unconventional and uncontrolled