Definition from macmillandictionary.com
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The bar has a casual low-key atmosphere.
The interview took place around the kitchen table and was very casual.
Paul tried to sound casual but I could tell something was worrying him.
The report notes the firm’s casual attitude towards safety procedures.
a casual meeting/remark
The disease cannot be spread by casual contact.
a casual labourer
The workforce is mainly unskilled and casual.
Even casual readers of the business pages will be aware of Greenspan’s influence.
He described himself as a casual acquaintance of the local MP.
He was only looking for casual sex.
Please dress casually.
She glanced casually through a magazine as she waited.