In a shocking, offensive, or extremely excessive way that crosses normal boundaries of acceptability.
From outrage (an extreme offense or insult) + -ous (full of) + -ly (adverb form). 'Outrage' comes from Old French outrage, from outre (beyond, excessive) + -age (suffix for action or state). The word evolved from describing extreme behavior to an adverb describing any shockingly excessive action.
The word 'outrage' originally meant physical violence, but thanks to the internet era, it now mostly describes people being angry about things—showing how language evolves when society changes what actually provokes us.
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