There’s only one way you can spell the adverb preferably. You can’t add another f, r, or l—there’s really no need to do it. Let’s be honest here—mistakes happen to the best of us. We’d have a hard time finding a writer who, at some point, didn’t miswrite “the” as “hte” or “teh.”

"Preferably" and "preferrably" are often confused, but only "preferably" is the correct spelling. "Preferably" is an adverb used to indicate a preference for one option over another, suggesting that something is more desirable.

The correct pronunciation of preferably is PREF-erably, but people are increasingly pronouncing it as pre-FER-ably. Again, this error makes sense to us because when we say the root word, we stress the second syllable: pre-FER.