| groundless(adjective, reason, poor, foolish, true) |
| unfounded(adjective, false, foolish, true, crazy) |
| unwarranted(adjective, right, reasonable, true, untrue) |
| idle(adjective, false, true, hollow, unwarranted) |
| unjustified(adjective, unwarranted, untrue, illogical, deceptive) |
| ungrounded(adjective, poor, negative, untrue, vacant) |
| bottomless(adjective, false, true, senseless, unwarranted) |
| gratuitous(adjective, false, unwarranted, untrue, necessary) |
| unjustifiable(adjective, unwarranted, substantiation) |
| unsupported(adjective, false, unwarranted, untrue, substantiation) |
| flimsy(adjective, poor, negative, untrue, implausible) |
| uncalled-for(adjective, false, senseless, unwarranted, untrue) |
| unsound(adjective, foolish, unreasonable, worthless, unacceptable) |
| false(adjective, poor, worthless, unwarranted, unacceptable) |
| indefensible(adjective, senseless, unwarranted, wanton, gratuitous) |
| unsubstantiated(adjective, substantiation) |
| untenable(adjective, substantiation) |
| invalid(adjective, foolish, unreasonable, worthless, unacceptable) |
| unsustainable |
| vain(adjective, inexistence) |