| insipid(adjective, dull, weak, flat, nasty) |
| bland(adjective, dull, weak, flat, boring) |
| flat(adjective, dull, weak, nasty, offensive) |
| flavorless(adjective, dull, weak, flat, nasty) |
| vapid(adjective, dull, weak, flat, nasty) |
| tasteless(adjective, weak, flat, nasty, offensive) |
| jejune(adjective, tasteless) |
| mild(adjective, dull, weak, flat, boring) |
| distasteful(adjective, dull, weak, flat, nasty) |
| flavourless |
| savourless |
| stale(adjective, dull, weak, flat, boring) |
| unsavory(adjective, dull, weak, flat, nasty) |
| weak(adjective, dull, flat, boring, tasteless) |
| unappetizing(adjective, dull, weak, flat, offensive) |
| unpalatable(adjective, dull, weak, flat, nasty) |
| watery(adjective, dull, weak, flat, boring) |
| dead |
| fade |
| wishy-washy |