1. done quickly and carelessly without attention to detail

1. in a quick and careless manner

Examples

• His slapdash approach to the project resulted in many errors.
• The report was written in a slapdash manner and needed major revisions.
• She painted the fence slapdash, missing several spots.
• The contractor’s slapdash work left the homeowner dissatisfied.
• He assembled the furniture slapdash without reading the instructions.
• The slapdash repairs fell apart within a week.