Correct spelling, explanation: extremely is the correct form, because here suffix -ly (adverb suffix) was added to the adjective extreme; we do not drop the final e, because -ly starts with a consonant, not a vowel.
Extremly is thus an incorrect form, even though pronunciation may point to no e there.
Definition of extremely:
adverb, in an unusual and often dangerous way; also: very much
Next holidays they want to go on an extremely long journey into the Amazon rainforest.
We were extremely excited about the event.
Incorrect spelling, explanation: This spelling is incorrect since we add an adverb suffix to full form adjectives, therefore extreme plus -ly is extremely, not
extremly. The suffix starts with a consonant, which means we do not skip the final e in a word, and because of that the correct form is extremely.
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