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Slipshod
Negative Connotation
The word 'slipshod' suggests poor quality and negligence, often resulting in disapproval or criticism. 
Informality Context
Use 'slipshod' in informal situations; it may be too casual for formal or academic writing. 
Hyperbole Caution
'Slipshod' can be an exaggeration, so make sure it matches the severity of the negligence described. 