haphazard

Without care; in a slapdash manner.

“the Prime Minister was wearing a grey suit and a white shirt with a soft collar, but his neck had become thinner and the collar stood away from it as if it had been bought haphazard”

Marked by great carelessness.

“a most haphazard system of record keeping”

Dependent upon or characterized by chance.

“a haphazard plan of action”