impenetrable
US /ɪmˈpen.ə.trə.bəl/
UK /ɪmˈpen.ə.trə.bəl/

1.
impenetrável, intransponível
impossible to pass through or enter
:
•
The fortress had an impenetrable defense system.
A fortaleza tinha um sistema de defesa impenetrável.
•
The dense jungle was almost impenetrable.
A selva densa era quase impenetrável.
2.
incompreensível, impenetrável
impossible to understand; incomprehensible
:
•
His handwriting was almost impenetrable.
A caligrafia dele era quase impenetrável.
•
The philosopher's theories were often impenetrable to the average person.
As teorias do filósofo eram frequentemente impenetráveis para a pessoa comum.