slapdash
Lacking in careful planning, arrangement, execution, etc., especially as a result of carelessness or haste. He failed to impress his interviewers with his slapdash answers. A: "Sorry that the meal is so slapdash." B: "That's all right—it's all really delicious!"
slap-dash
mod. fast and careless. I wish you hadn’t done it in such a slap-dash fashion.