weaksauce

Short definition from Wiktionary

Adjective

1. 1
   Lacking in interest or substance; boring, disappointing, lacklustre.

Noun

1. 1
   Someone or something that is lacking in interest or substance.
2. 2
   The quality or state of lacking in interest or substance; boringness, disappointment.
3. 3
   Synonym of weak tea (“weak or feeble arguments, efforts, or proposals”).