| mindless(adjective, foolish, unreasonable, illogical) |
| senseless(adjective, foolish, stupid, unreasonable, irrational) |
| irrational(adjective, foolish, stupid, mad, unreasonable) |
| unreasonable(adjective, foolish, mad, irrational, worthless) |
| capricious(adjective, foolish, stupid, senseless, irrational) |
| crazy(foolish, unreasonable, illogical, insanity) |
| causeless(adjective, senseless, unwarranted, wanton, superfluous) |
| demented(adjective, foolish, unreasonable, illogical, insanity) |
| fallacious(adjective, wrong, false, foolish, unreasonable) |
| insane(foolish, unreasonable, illogical, insanity) |
| invalid(adjective, foolish, unreasonable, irrational, worthless) |
| mad(foolish, stupid, unreasonable, senseless, irrational) |
| unreasoning(foolish, unreasonable, irrational, illogical, arbitrary) |
| arbitrary(adjective, foolish, stupid, senseless, irrational) |
| baseless(adjective, false, foolish, crazy, unreasonable) |
| daft(adjective, insanity) |
| foolish(adjective, stupid, unreasonable, senseless, irrational) |
| gratuitous(adjective, unwarranted, untrue, flimsy, necessary) |
| insensate(adjective, insanity) |
| sophistic(adjective, foolish, mad, unreasonable, irrational) |