impregnable(1) (iou) and persevere (oh)

impregnable(1) (iou)

impregnable adjective1. LME.
[Old French imprenable, formed as IM-2 + prenable takeable, from pren- stem of prendre take from Latin prehendere: see -ABLE; -g- perh. after reign, and Old French vars.]
(Of a fortress etc.) unable to be taken by force; fig. proof against attack, unassailable.
A. MacLean The Schloss Adler is inaccessible and impregnable. It would require a battalion of paratroops to take it. A. Storr She carries within an impregnable conviction of being lovable.
impregna'bility noun M19.
impregnableness noun (long rare) E17.
impregnably adverb E17.

persevere (oh)

[Date: 1300-1400; Language: French; Origin: perseverer, from Latin perseverare, from severus; SEVERE]
to continue trying to do something in a very determined way in spite of difficulties - use this to show approval
::It can be tricky at first, but persevere.
persevere with
::He persevered with his task until he had succeeded in collecting an armful of firewood.
persevere in (doing) sth
::She had persevered in her claim for compensation.
-- persevering adj

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