happening by chance; fortuitous

a casual meeting.

without definite or serious intention; careless or offhand; passing

a casual remark.

seeming or tending to be indifferent to what is happening; apathetic; unconcerned

a casual, nonchalant air.

appropriate for wear or use on informal occasions; not dressy

casual clothes; casual wear.

irregular; occasional

a casual visitor.

accidental

a casual mishap.

Obsolete . uncertain.

a worker employed only irregularly.

a soldier temporarily at a station or other place of duty, and usually en route to another station.

adjective

deliberate , painstaking , planned , premeditated , formal , serious

adjective

accidental , adventitious , by chance , contingent , erratic , extemporaneous , extempore , fluky , fortuitous , impromptu , improvised , impulsive , incidental , infrequent , irregular , occasional , odd , offhand , serendipitous , spontaneous , uncertain , unexpected , unforeseen , unintentional , unplanned , unpremeditatednotes:casual means suited for everyday use , informal or occurring by chance - while causal means involving or constituting a cause , aloof , apathetic , blas , breezy , cool * , cursory , detached , down home , easygoing , folksy * , homey * , incurious , indifferent , informal , insouciant , lackadaisical , laid-back * , loose * , low-pressure , mellow , perfunctory , pococurante , purposeless , remote , unconcerned , unfussy , uninterested , withdrawnnotes:casual means suited for everyday use , chance , inadvertent , easy , natural , relaxed , unceremonious , unrestrained , carefree , debonair , desultory , dishabille , disorganized , free and easy , haphazard , homey , idle , indiscriminate , loose , nonchalant , precarious , random , stray , superficial , unimportant , unpremeditated , unstructured , unstudied