In a way that is impressive, dramatic, and very noticeable; with great visual impact or effect.
From 'spectacle' (Latin 'spectaculum,' something to watch) plus '-ular' and '-ly' (adverb). It originally related to theatrical or impressive displays.
Spectacularly comes from the Latin word for 'things to watch,' and now it's an adverb—showing how language evolved from describing passive viewing into actively describing how impressively something happens, making the observer part of the action.
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