INSUPERABLE
insuperable, insurmountable
(adjective) impossible to surmount
insuperable, unconquerable
(adjective) incapable of being surmounted or excelled; “insuperable odds”; “insuperable heroes”
Source: WordNet® 3.1
Etymology
Adjective
insuperable (comparative more insuperable, superlative most insuperable)
Impossible to achieve or overcome or be negotiated.
Overwhelming or insurmountable.
Synonyms
• unsuperable
Antonyms
• superable
Source: Wiktionary
In*su"per*a*ble, a. Etym: [L. insuperabilis: cf. OF. insuperable. See
In- not, and Superable.]
Definition: Incapable of being passed over or surmounted; insurmountable;
as, insuperable difficulties.
And middle natures, how they long to join, Yet never pass the
insuperable line Pope.
The difficulty is enhanced, or is . . . insuperable. I. Taylor.
Syn.
– Impassable; insurmountable; unconquerable.
– In*su"per*a*ble*ness, n.
– In*su"per*a*bly, adv.
Source: Webster’s Unabridged Dictionary 1913 Edition