得不得了 (de bùdéliǎo) can be used as a complement to suggest a situation is serious, or is likely to result in perhaps terrible consequences. It can be used in a positive sense, like in English when we say "I'm terribly happy".

Structure

Examples

Shēnɡ zhí de shì qínɡ rànɡ tā ɡāo xìnɡ dé bù dé liǎo.
升职 的 事情 让 他 高兴 得 不得了。
The things that came up made him extremely happy.