The crux of the argument is that disadvantages encountered like lack of parental support and the expensive schools enjoyed by Harriet Harman and Polly Toynbee «s children is a impenetrable barrier. (liberalconspiracy.org)
It has its harrowing moments, but the psychological thriller Jasmine is an impenetrable mystery for most of its running time, and deliberately so. (metacritic.com)
For instance, amendments to the immigration rules introduced in July 2012 purporting to comprehensively embody Art 8 (the much criticised Appendix FM), are impenetrable for even the most experienced immigration lawyers. (newlawjournal.co.uk)