The term 'deadbeat' originated in the U.S. and may be less familiar in other English-speaking countries. I never knew what a deadbeat was until I watched American shows.
Pro Tip 2/3
Negative Connotation
'Deadbeat' has a negative tone, suggesting irresponsibility and a lack of and ambition. He was called a deadbeat for never paying back his loans.
Pro Tip 3/3
Not for Formal Settings
Avoid using 'deadbeat' in formal contexts; it's casual slang and might be disrespectful. In court, they described him as an individual who neglected financial responsibilities, not a deadbeat.