unforgivingly

Adverb

Meaning

without forgiveness; in an unforgiving manner

Source: WordNet

brutally cruelly severely ruthlessly atrociously barbarously bestially harshly mercilessly unsympathetically ruggedly inhumanly callously unfeelingly pitilessly

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forgivingly goodly politically socially gently kindly

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unforgivingly, he insisted that she pay her debt to the last penny Source: Internet

unforgiveness unforgiver unforgiving unforgivingness unforgoable unforgone