gross negligence

from Bouvier's Law Dictionary, Revised 6th Ed (1856)
GROSS NEGLIGENCE. Lata culpa, or, as the Roman lawyers most accurately call 
it) dolo proxima, is, in practice, considered as equivalent to dolus or 
fraud itself, and consists, according to the best interpreters, in the 
omission of that care which even inattentive and thoughtless men never fail 
to take of their own property. Jones on Bailments, 20. It must not be 
confounded, however, with fraud, for it may exist consistently with good 
faith and honesty of intention, according to common law authorities. 
    

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