1.b> , i> ; ; impenetrable armour ; cloth impenetrable to water [moisture] , [] ;
2.b> , ; impenetrable jungle ; impenetrable desert [ice-fields, forests] [ , ];
3.b> 1) , ..i> , i> ; impenetrable darkness [gloom] / []; the hills lay shrouded in impenetrable mist ;
2) , i> ; impenetrable mystery / ; impenetrable plot ; impenetrable countenance , ; the impenetrable depths of the sea ;
4.b> / ( , ..i>); a mind impenetrable by / to / new ideas / .