1. clumsy or incompetent people; bunglers
Usage: informal; plural form
2. mediocre or unskilled boxers
Usage: boxing slang; plural form

Examples

• The coach was frustrated with the stumblebums on his team who kept making basic errors.
• Those stumblebums in accounting mixed up the invoices again.
• The gym was full of stumblebums who couldn’t land a decent punch.
• Don’t trust those stumblebums to handle the delicate equipment.
• The promoter matched the champion against a couple of stumblebums for easy wins.
• We can’t afford to hire any more stumblebums for this important project.