In a manner that is excessive, unreasonable, or far beyond normal limits; extremely or outrageously.
Formed from exorbitant plus the adverbial suffix -ly, which transforms adjectives into adverbs. The suffix -ly comes from Old English -lice, meaning 'in the manner of,' and is the primary way English creates adverbs from adjectives.
The -ly suffix is so universal in English that we often don't notice we're using it, but it's one of the most efficient features of the language—almost any adjective can become an adverb instantly, which is why English can describe actions with incredible precision!
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