| fruitless(adjective, flat, difficult, unpleasant, useless) |
| profitless(adjective, flat, idle, useless, ineffective) |
| thankless(adjective, difficult, unsatisfactory, trying, fruitless) |
| unprofitable(adjective, flat, difficult, unpleasant, dry) |
| useless(adjective, flat, difficult, unpleasant, idle) |
| unproductive(adjective, flat, useless, wasted, ineffective) |
| bootless(adjective, arouse bad feelings) |
| futile(adjective, flat, difficult, unpleasant, useless) |
| barren(adjective, flat, unpleasant, idle, useless) |
| pointless(adjective, dry, idle, useless, ineffective) |
| unavailing(adjective, dry, idle, useless, ineffective) |
| unrequited(adjective, difficult, unpleasant, trying, unappreciated) |
| vain(adjective, flat, difficult, unpleasant, idle) |
| abortive(adjective, arouse bad feelings) |
| ineffective(adjective, arouse bad feelings) |
| unappreciated(adjective, difficult, unpleasant, trying) |
| ineffectual(adjective, arouse bad feelings) |
| sterile(adjective, dry, idle, useless, wasted) |
| unremunerative(adjective, dry, idle, useless, fruitless) |
| unsuccessful(adjective, arouse bad feelings) |