In an extremely good, impressive, or unbelievable way.
From 'fantastic,' which comes from Greek 'phantastikos' meaning 'of the imagination.' The suffix '-ally' transforms the adjective into an adverb describing how something happens.
The root 'phanstastikos' is the same source as 'phantom'—so when something is 'fantastic,' you're basically saying it's like something from your imagination come to life!
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