Grammar and Punctuation The Blue Book of Grammar and Punctuation

More Importantly, Most Importantly

At issue is the ly, which some find unnecessary (and somewhat snooty). Many sticklers do not accept importantly in the two sentences that follow: I left my bed and, more importantly, I left the house. Most importantly, Churchill was a statesman. Critics of those sentences would prefer "more important" (what is more important, I left the house) and "most important" (what is most important, Churchill was a statesman).

Other experts declare the phrases acceptable with or without ly. But since brevity is a virtue, why not drop the ly and save yourself a superfluous syllable?

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