Terrible or dreadful; used to express a strongly negative, often frightening degree of something.
あの事故の映像は本当にすごい光景だった。
The footage of that accident was truly a dreadful sight.
昨日の嵐で被害がすごかった。
The damage from yesterday's storm was terrible.
彼の怪我はすごい深刻で、入院が必要だ。
His injuries are very serious and require hospitalization.
Amazing, terrific, wonderful — used to express admiration or astonishment at someone's skill, strength, etc.
彼女のピアノ演奏は本当にすごい。
Her piano performance is truly amazing.
すごい！自分でその家具を作ったの？
Amazing! Did you make that furniture yourself?
彼は数学がすごく得意だ。
He's really good at math.
To a great extent; indicating a very large amount or degree (vast, immense).
イベントの参加者はすごい数になった。
The number of event participants became huge.
最近、仕事がすごい量で忙しい。
Lately I've been busy with an enormous amount of work.
この本は評判がすごく広がっている。
The reputation of this book has spread enormously.
Used colloquially as an adverb meaning 'very' or 'awfully' (colloquial variant of すごく).
今日はすごい疲れたから早く寝る。
I'm really tired today, so I'll go to bed early.
この映画、すごい面白かったよ。
This movie was really interesting/funny.
彼はすごい優しい人だね。
He's a really kind person, isn't he?