Word Study
insurmountable
CIDE DICTIONARY
insurmountable, a. [Pref. in- not + surmountable: cf. F. insurmountable.].
Incapable of being passed over, surmounted, or overcome; insuperable; as, insurmountable difficulty or obstacle. Locke. [1913 Webster]
"Hope thinks nothing difficult; despair tells us that difficulty is insurmountable."
Syn. -- Insuperable; impassable; invincible.
OXFORD DICTIONARY
insurmountable, adj. unable to be surmounted or overcome.
Derivative
insurmountably adv.
THESAURUS
insurmountable
beyond one, impassable, impracticable, impractical, indomitable, inoperable, insuperable, invincible, too much for, unachievable, unattainable, uncompassable, unconquerable, undoable, uneffectible, unnegotiable, unperformable, unrealizable, unsurmountable, unworkableROGET THESAURUS
insurmountable
Impossibility
N impossibility, what cannot, what can never be, sour grapes, hopelessness, impossible, not possible, absurd, contrary to reason, unlikely, unreasonable, incredible, beyond the bounds of reason, beyond the bounds of possibility, beyond the realm of possibility, from which reason recoils, visionary, inconceivable, prodigious, unimaginable, inimaginable, unthinkable, impracticable unachievable, unfeasible, infeasible, insuperable, unsurmountable, insurmountable, unattainable, unobtainable, out of reach, out of the question, not to be had, not to be thought of, beyond control, desperate, incompatible, inaccessible, uncomeatable, impassable, impervious, innavigable, inextricable, self- contradictory, out of one's power, beyond one's power, beyond one's depth, beyond one's reach, beyond one's grasp, too much for, ultra crepidam, the grapes are sour, non possumus, non nostrum tantas componere lites, look for a needle in a haystack, chercher une aiguille dans une botte de foin, il a le mer +a boire.For further exploring for "insurmountable" in Webster Dictionary Online