He completed the project in a slapdash manner, resulting in numerous errors.
The chef's slapdash work in the kitchen led to a disappointing meal for the customers.
The contractor did a slapdash job on the renovations, leaving many unfinished details.
She took a slapdash approach to studying for the exam, and as a result, she failed.
She threw together an outfit in a slapdash fashion, not caring about how it looked.