no screaming hell

Adjective

Canada idiomatic not-comparable

(Canada, idiomatic) Not particularly effective or impressive; below expectations.

Japanese Meaning

期待外れで、効果的・印象的ではなく、望んだ成果が得られない状態 / 十分な効果や印象を与えず、全体的に期待に沿わない様子

The new app update was no screaming hell of an improvement, but at least it fixed some bugs.

新しいアプリのアップデートは大した改善ではありませんでしたが、少なくともいくつかのバグは修正されました。

Sense（1）

(Canada, idiomatic) Not particularly effective or impressive; below expectations.

In overall management skills, "he's no screaming hell," says the analyst. "He doesn't have the long view."