(1) The mystery is not impenetrable to intellect or unintelligible in itself; rather, it is not fully intelligible to us.

(2) The island is full of impenetrable virgin forest ill-suited to bikes, leaving the last leg to be completed on foot.

(3) Truth be told, our music is a smoky, impenetrable fortress.

(4) When present, it often forms dense, impenetrable thickets.

(5) Lots of fields have their own jargon that is impenetrable to outsiders.

(6) Unfortunately, anything that involves more than a simple sense is more complicated and the barriers are often impenetrable .

(7) But as a technology columnist, I'm in the business of coming up with confusing and impenetrable reactions to events around me.

(8) But for most parents the school classroom is a place as mysterious and impenetrable as their teenager's bedroom.

(9) I just knew that one day the battalion of trees would overtake this weak stretch of highway and obscure its existence with an impenetrable density.

(10) The spiky reed makes areas impenetrable , both for hunting and for cattle grazing.

(11) The impenetrable jargon of much postmodern writings is an issue as well.

(12) In front of him was an impenetrable wall that he could not see his way around.

(13) They forget, if they ever knew, that Shakespeare can seem impenetrable .

(14) He might just be the model academic in that he elucidates the otherwise impenetrable idiolect of abstruse theory by using the vernacular of Pop cult allusion, and he makes it seems as if the two were made for one another.

(15) I found some of the interviews in this book fascinating, others I found impenetrable ; but my general feeling was that book didn't deliver.

(16) Music industry insiders tend to litter their conversation with talk of turnover, market share and the impenetrable jargon of contract negotiations.

(17) The first three chapters of the book are hard going and, at times, impenetrable and needlessly obscure.

(18) The wording of the document is really very easy to understand; it is not written in the usual impenetrable verbiage of the Treaties.

(19) The creation of life in general and of the human person in particular is a thing we can know a little about, but also a thing which is shrouded in impenetrable mystery.

(20) To my horror though, I did not catch myself upon hitting the wall, but proceeded to pass through it into impenetrable darkness.