| infeasible(adjective, wild, unreasonable, useless, absurd) |
| intolerable(adjective, pain, terrible, unacceptable, incredible) |
| illogical(adjective, wild, unreasonable, useless, absurd) |
| implausible(adjective, hard, great, difficult, extraordinary) |
| ludicrous(adjective, absurd, intolerable, ungovernable) |
| unachievable(adjective, impractical, pessimistic, desperate, unpromising) |
| unrealistic(adjective, false, wild, practical, absurd) |
| unreasonable(adjective, hard, difficult, unusual, stupid) |
| insupportable(adjective, pain, extreme, painful, insufferable) |
| irreparable(adjective, hopeless, unable) |
| cringeworthy |
| incurable |
| out of the question(expression, adjective, idiom, wild, stupid) |
| outlandish(adjective, hard, difficult, extraordinary, silly) |
| unrealizable(adjective, unreasonable, possible, inaccessible, unpractical) |
| unsufferable(adjective, pain, unbearable) |
| imaginary(adjective, perfect, ideal, number, lofty) |
| incomprehensible |
| irremediable(adjective, hopeless) |
| paradoxical(adjective, absurd) |