In a careless manner

Usage examples of slapdash.

Trees grew out of their sides at slapdash angles, curving upwards, supported by vast buttress roots.

It could have been—probably was—just that smelly mullet-head with a slapdash plan and a lot of nerve.

Terekhov picked out the lucky Tomcat by the slapdash flying style of its pilot and turned to line up on him.

So the play became an incongruous mongrel slapdashed out of contradictory elements.