In a manner characterized by hacking; in a way that involves rough cutting, chopping, or coughing; done in the style of a hack writer or mediocre worker.
From hack + -ing (present participle) + -ly (adverb suffix). This compounds two suffixes to turn the verb 'hack' into an adverb describing how an action is performed, following standard English word formation patterns.
The word 'hackingly' is rare but poetic—it describes that rough, uneven way of doing something, like a sword strike that chops unevenly rather than cutting clean, which is exactly what medieval 'hack' originally meant!
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