Definition of blackly adverb from the Oxford Advanced American Dictionary

 

blackly

 adverb
adverb
NAmE//ˈblækli//
 
blackly comic/funny/humorous/satirical
 
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dealing with unpleasant or terrible things, such as murder, in a humorous way The movie takes a blackly humorous look at climate change.
See the Oxford Advanced Learner's Dictionary entry: blackly