| bootless | useless, worthless, fruitless, unavailing |
| bootless | fruitlessly, uselessly, unsuccessfully, in vain |
| causeless | for no reason, without justification, groundlessly |
| causeless | outside the normal course of nature, inexplicable by natural causes |
| causeless | groundless, unjustified, idle |
| chaffy | [as of chaff] worthless, useless, trashy |
| edgeless | blunted, useless, ineffective |
| effectless | ineffective, fruitless, useless |
| fruitless | barren, sterile, useless |
| helpless | unavailing, useless, unprofitable |
| idle | useless, barren, worthless |
| naught | worthless, useless, of no value |
| thriftless | useless, worthless, unprofitable |
| uneffectual | ineffectual, ineffective, useless |
| vain | worthless, idle, useless, empty |
| vainly | uselessly, fruitlessly, ineffectively |