Meaning: done hastily and carelessly:
* "The company's slapdash marketing campaign resulted in a lot of negative feedback."
* "He built the bookcase with a slapdash approach, using only a hammer and nails."
* "The slapdash repairs to the roof only lasted a few months before it started leaking again."
Meaning: something hastily thrown together:
* "The students put together a slapdash presentation the night before the deadline."
* "The team's slapdash attempt at a website was quickly abandoned."
* "He built a slapdash shelter out of branches and leaves."
Meaning: in a careless or haphazard way:
* "She tackled the problem in a slapdash manner, without considering all the implications."
* "The artist's slapdash brushstrokes created a chaotic but interesting piece."
* "The slapdash way they handled the project caused a lot of problems."