Correct spelling, explanation: mistakenly is the correct form because it follows the standard rules of English word formation. It is formed by adding the -ly suffix to the adjective mistaken. The -ly suffix is commonly added to adjectives to form adverbs that describe how an action is performed. Mistakely is not recognized as a correct word in English. It is a misspelling or a non-standard variation of mistakenly. Since mistakely is not a standard word, it should not be used in formal writing or speech. Mistakenly is the only correct form.

Definition of mistakenly:
Adverb, in a mistaken way; wrongly.
She mistakenly left her keys at the restaurant last night.
The cashier mistakenly gave me the wrong change.

Collocations with mistakenly:
Some of the most commonly used collocations include:
1. Mistakenly believe: to hold a belief that is incorrect due to misunderstanding or misinformation.
Many people mistakenly believe that vaccines can cause autism, despite scientific evidence to the contrary.
2. Mistakenly assume: to make an assumption that is incorrect or unfounded.
He mistakenly assumed that she would be attending the party, but she had other plans.
3. Mistakenly identify: to incorrectly recognize or name someone or something.
The witness mistakenly identified the man in the lineup as the perpetrator of the crime.
4. Mistakenly delete: to unintentionally remove or erase something.
I mistakenly deleted all my important files from the computer and now I can’t recover them.

Incorrect spelling, explanation: mistakely is incorrect because it is a misspelling and does not conform to the standard rules and conventions of the English language. The correct and accepted adverbial form is mistakenly, which should be used in formal writing and speech to describe actions or beliefs done in error or by mistake. The base word of mistakenly is mistaken, not mistake. Mistaken is an adjective that describes something that is incorrect or wrong due to a misunderstanding or error. When you add the -ly suffix to mistaken, it forms the adverb mistakenly, which describes how an action is done in an incorrect or mistaken manner.

Incorrect spelling