adverb, noun
Expresses degree or extent, often with a sense of surprise or emphasis. Used both adverbially and as a noun.
これほど難しいとは思わなかった。
I didn't think it would be this difficult.
これほどの成功は初めてだ。
This is the first time I've had this much success.
Kanji form using 此れ and 程; rarely used.
そんなに is used for 'that much' (referring to something distant from the speaker), while これほど refers to 'this much' (close to the speaker).
あんなに is used for 'that much' (referring to something distant from both speaker and listener), while これほど refers to 'this much' (close to the speaker).
こんなに is a more casual and common way to say 'this much', while これほど can sound slightly more formal or emphatic.
Compound of これ (this) and ほど (extent, degree).