weaksauce

Noun

slang uncountable

(slang) Something that is boring or disappointing. / (slang) The state or quality of being boring or disappointing.

Japanese Meaning

つまらないもの、退屈で期待外れなもの

The new sequel turned out to be total weaksauce after all the hype.

あれほどの宣伝のあとで、その新しい続編は完全に期待外れだった。

Sense（1）

(slang) Something that is boring or disappointing.

Sense（2）

(slang) The state or quality of being boring or disappointing.