Indecently abusive (10)

I believe the answer is:

scurrilous

(Other definitions for scurrilous that I've seen before include "Unjustifiably defamatory" , "Grossly insulting" , "Obscenely slanderous" , "Scandalously damaging" , "Humorously insulting" .)

I've seen this clue in the Sydney Morning Herald.

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