| ineffective(adjective, weak, stupid, idle, useless) |
| ineffectual(adjective, weak, stupid, idle, useless) |
| inept(adjective, weak, stupid, idle, useless) |
| inoperative(adjective, weak, stupid, idle, useless) |
| insignificant(adjective, value, unimportant, irregular, empty) |
| insubstantial(adjective, value, insignificant, unimportant, empty) |
| inutile(adjective, stupid, idle, useless, incompetent) |
| involuntary |
| irregular(adjective, insignificant, useless, empty, senseless) |
| motiveless(adjective, awkward, insignificant, irregular, useless) |
| needless(adjective, irregular, senseless, wanton, nonsensical) |
| no good(expression, adjective, stupid, idle, incompetent) |
| nonfunctional(adjective, weak, stupid, idle, incompetent) |
| nonsensical(adjective, value, insignificant, unimportant, irregular) |
| nothing(adjective, value, insignificant, unimportant, empty) |
| nugatory(adjective, value, insignificant, unimportant, empty) |
| of no use(expression, adjective, idiom, stupid, idle) |
| pointless(adjective, value, stupid, insignificant, idle) |
| profitless(adjective, weak, stupid, idle, incompetent) |
| purportless(adjective, value, awkward, insignificant, unimportant) |