
Dead beat
American Origin
The term 'deadbeat' originated in the U.S. and may be less familiar in other English-speaking countries. 
Negative Connotation
'Deadbeat' has a negative tone, suggesting irresponsibility and a lack of and ambition. 
Not for Formal Settings
Avoid using 'deadbeat' in formal contexts; it's casual slang and might be disrespectful. 