| unavailing(adjective, poor, base, inferior, insignificant) |
| idle(adjective, silly, foolish, useless) |
| stupid(adjective, dull, simple, flat, slow) |
| dull(adjective, weak, simple, sharp, slow) |
| flat(adjective, dull, silly, ordinary) |
| hopeless(adjective, stupid, idle, useless) |
| insipid(adjective, dull, weak, flat, silly) |
| jejune(adjective, dull, weak, flat, silly) |
| sterile(adjective, poor, base, inferior, insignificant) |
| dead(adjective, dull, weak, flat, stupid) |
| unrewarding(adjective, idle, useless, ineffective) |
| commonplace(adjective, dull, flat, ordinary) |
| heavy(adjective, flat, stupid, ordinary) |
| inutile(adjective, poor, base, stupid, inferior) |
| unfruitful(adjective, idle, product, useless) |
| uninteresting(adjective, dull, weak, flat, ordinary) |
| vapid(adjective, dull, weak, flat, value) |
| arid(adjective, dull, flat, stupid, ordinary) |
| blah(adjective, dull, weak, flat, ordinary) |
| colorless(adjective, dull, weak, flat, ordinary) |