adjective
beyond the bounds of possibility
Synonyms: absurd, beyond, contrary to reason, cureless, futile, hardly possible, hopeless, hundred-to-one, impassable, impervious, impracticable, impractical, inaccessible, inconceivable, inexecutable, infeasible, insurmountable, irrealizable, irreparable, no-go, not a prayer, no-way, no-win, out of the question, preposterous, too much, unachievable, unattainable, uncorrectable, unfeasible, unimaginable, unobtainable, unreasonable, unrecoverable, unthinkable, unworkable, useless, visionary, way out
Antonyms: achievable, believable, obtainable, possible, reasonable, tenable
adjective
intolerable, ungovernable
Synonyms: absurd, egregious, hopeless, improper, incongruous, ludicrous, objectionable, offensive, outrageous, preposterous, unacceptable, unanswerable, undesirable, unreasonable, unsuitable
Antonyms: behaving, good, governable, manageable, tolerable