If something is scurrilous, it's meant to offend. Scurrilous rumors can give you a bad rep, and scurrilous stories sell tabloid magazines.

If something is scurrilous, it doesn't necessarily mean it isn't true: that celebrity may well be pregnant, on drugs, or getting divorced — or possibly all three — but it does suggest a certain indifference to the truth on the part of the person being scurrilous.

Definitions of scurrilous

adj expressing offensive reproach

abusive, opprobrious
causing anger or annoyance

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