Correct spelling, explanation: grammatically speaking the word unmistakably is an adverb and the root of the word is mistake, which has its origin in an Old Norse word mistaka. The meaning of the word was to take in error. The word unmistakably is formed by adding the prefix -un and suffix -ably to the root of the word.
Definition of unmistakably:
1. adverb – used when something is easy, clear, and won’t be confused with anything else;
Her accent is unmistakably French, but you can ask her if you don’t believe me.
Unmistakably word family:
Some words that belong to the same word family as unmistakably include mistake, mistaken and unmistakable.
Incorrect spelling, explanation: when we want to form an adjective or an adverb in English, a popular suffix added to a word is -ably or -ably. However, the spelling of the root word often changes then. This happens in the case of the word unmistakably. When we add the -ably ending to the word mistake, the -e letter disappears. Therefore the correct spelling is unmistakably and not unmistakeably.
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Sorry, but you’re wrong.
Correct spelling: unmistakably
Also correct spelling: unmistakeably
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I think you should back up your sources. Says who that UNMISTAKEABLY is spelt wrong. I for one have written both into a word document and they both seem to be accurate. You may be right as I have not yet found a source that gives me a clear answer. However I resent the fact, you haven’t backed up your source. I as a viewer, do not know whether you got the answer UNMISTAKABLY from a respectable dictionary or whether it was a survey or just a snotty nosed, pimpled little boy who wants to set everyone wrong. I do not trust the credibility of this website as it has underlined the word spelt in my reply and I know for a fact that spelt is a word.