Incorrect spelling, explanation: -ly is the suffix to create an adverb from an adjective. Here the core adjective is extreme, so we just add -ly and the correct adverb is extremely. Dropping e is incorrect as the suffix starts with a consonant (l).
Extremly is therefore an incorrect form.
Correct spelling, explanation: The core word for this form is the adjective extreme. To create an adverb from an adjective we add the suffix -ly. Therefore the correct adverbial from the word extreme is extremely. We don’t skip e when adding the suffix which starts with a consonant, and this is why
extremly is the wrong spelling.
Definition of extremely:
adverb, in a way that is extreme – dangerous, extraordinary; also: very much
The way he was driving was extremely dangerous.
He was extremely happy when he got into Harvard.
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