In a hard or harsh manner; with toughness or severity.
Formed from the verb 'harten' or the adjective base 'hart' (hard) combined with the adverbial suffix '-ly.' This archaic adverb reflects older patterns of English word formation before standardization.
Old adverbs like 'hartly' remind us that English once had much more flexibility in its word endings—you could add '-ly' to almost any adjective, creating adverbs that sound poetic and strange to modern ears.
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