One who is neither soaking up nor admitting encouragement, but is hard, like rock, or like something else which is hard, so that he is not soaked through even by water.[1]
Sophocles [writes]: "but thus you will appear impervious and impracticable."[2] Meaning unsympathetic, tearless. For τέγγειν ["to moisten"] [is] to wet. But "impracticable" [ἀτελεύτητος ] [means] inexorable, unbiddable, relentless.
And elsewhere: "Marcus, being impervious and stubborn, able to withstand all troublesome things, withdrew, carried away by the calamities for humankind."[3]
And elsewhere: "fastening stones to their feet, they threw them into the sea imperviously and mercilessly."[4]
To impervious men [ἀτέγκτοις ], to those not wet by tears or sweat.
Aelian [writes]: "casting everyone into pity and tears, so that both the impervious and tough cried."[5]
Also [sc. attested is the related adverb] ἀτέγκτως ["imperviously"], [meaning] exceedingly.
"And priestesses at first attempted to calm him and hold him back from his anger. When he was disposed [to be] impervious and violent, those things which it is better not to see, those which were not his business, and those first things from which nothing terrible would be met with either by the audience or the players; they were able to see these things."[6]
And elsewhere: "things sufficient to persuade and abash the souls of those who had [souls] not in every way impervious and tough."[7]
Aelian [writes]: "this boy was impervious and cruel, and he set for himself laborious [tasks] and those which were of the utmost danger."[8]