Insipid

lacking interest or flavor

1. Lacking flavor: "insipid coffee".
2. Lacking vigor or interest: "insipid, shallow books".

The critic claimed that the painting was insipid, containing no interesting qualities at all.
While the rice fills my stomach it is rather insipid without any soy sauce and toppings.

Synonyms: banal, bland, dull, stale, vapid