insuperable

From Latin insuperabilis

• (US) IPA^(key): /ɪnˈsup(ə)ɹəb(ə)l/

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insuperable (comparative more insuperable, superlative most insuperable)

1. Impossible to achieve or overcome or be negotiated.
   • 2012, James Lambert, “Beyond Hobson-Jobson: A new lexicography for Indian English”, in World Englishes‎, page 308:

     While Indian English may not have a uniform standard form throughout the country, this in itself is not an insuperable obstacle for lexicography.

2. Overwhelming or insurmountable.

• unsuperable

• superable

• insuperableness

• insuperability

• impassable
• unconquerable

• insuperable in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.
• insuperable in The Century Dictionary, The Century Co., New York, 1911
• insuperable at OneLook Dictionary Search

insuperable (plural insuperables)

1. insuperable

• superable