Synonyms of 'harshness'
They treated him with extreme harshness.
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Acrimony is bitter and angry words or quarrels.
The council's first meeting ended in acrimony.
If you say something with asperity, you say it impatiently and severely.
'I told you he had no idea,' she remarked with some asperity.
Thesaurus for harshness from the Collins English Thesaurus