1An adverb meaning "to that degree" or "that much," comparing something to a level already mentioned. Very often paired with a negative — それほど〜ない — to mean "not that much / not so."
この問題はそれほど難しくない。
This problem isn't that difficult.
彼の作った料理はそれほどおいしくなかった。
The dish he made wasn't that tasty.
「褒められて嬉しかったでしょう」「いや、それほどでもないよ」
"You must have been happy to be praised." "No, not really."
それほど混んでいなかったので、すぐ座れた。
It wasn't that crowded, so I could sit down right away.