そんなに~ない
Not as much as you might think
You'll be able to correct an assumption by saying something is not true to the degree the listener suggested.

この荷物はそんなに重くないです。
kono nimotsu wa sonna ni omokunai desu.
What do you think this sentence means?
This luggage is not that heavy.
Reject an assumed degree
そんなに~ない means not that much or not as much as suggested. It responds to a degree raised by the listener or situation.
駅はそんなに遠くありません。
eki wa sonna ni tooku arimasen.
The station is not that far away.
Form and use そんなに~ない
This differs from a neutral あまり~ない because it points back to an assumed degree. そんなに can also occur affirmatively; the negative use here denies that level.
駅はそんなに遠くありません。
eki wa sonna ni tooku arimasen.
The station is not that far away.
今日はそんなに忙しくないです。
kyou wa sonna ni isogashikunai desu.
I am not that busy today.
この仕事はそんなに難しくないですから、心配しないでください。
kono shigoto wa sonna ni muzukashiku nai desu kara, shinpai shinaide kudasai.
This job isn't as hard as you think, so please don't worry.
え、このかばん、そんなに高くなかったよ。三千円だった。
e, kono kaban, sonna ni takaku nakatta yo. sanzen'en datta.
What? This bag wasn't that expensive. It was 3,000 yen.
日本語はまだそんなに上手じゃありません。
nihongo wa mada sonna ni jouzu ja arimasen.
My Japanese isn't that good yet.
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