1) Baloney 2) Been there, done that feeling 3) Bombast 4) Boring 5) Boring triplet 6) Borrrring 7) Bunkum 8) Causing a meh 9) Claptrap 10) Dispirited 11) Drab 12) Drivel 13) Dull 14) Dull and drab 15) Dull and lifeless 16) Dull and unattractive 17) Dull and uninteresting 18) Dull as dishwater 19) Dull, dull, dull 1) Banal 2) Bombast 3) Boring 4) Claptrap 5) Drab 6) Fustian 7) Ho-hum 8) Pale 9) Prosaic 10) So so 11) Yada 
(Thai) fish
Blah is slang for worthless talk.