Insuperable

Adjective

 * 1) Impossible to achieve or overcome or be negotiated.
 * 2) Overwhelming or insurmountable.

Antonyms

 * superable

Derived terms

 * insuperableness

Related terms

 * insuperability

Thesaurus
beyond one, impassable, impenetrable, impracticable, impractical, impregnable, incontestable, indomitable, inexpugnable, inoperable, insurmountable, invincible, inviolable, invulnerable, irresistible, overpowering, overwhelming, resistless, too much for, unachievable, unassailable, unattainable, unbeatable, uncompassable, unconquerable, undoable, uneffectible, unnegotiable, unperformable, unrealizable, unsubduable, unsurmountable, unsurpassable, unworkable, unyielding