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Shoddy
Negative Connotation
The word 'shoddy' implies disapproval and suggests that something is not just poor quality but also disappointingly so. 
Non-Literal Use
'Shoddy' can be used metaphorically to describe anything poorly done, not just physical items. 
Casual Critique
Use 'shoddy' in informal situations, like when critiquing a friend's hasty work, not in formal analysis. 