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in the PONS Dictionary

impenetrable [impeneˈtraβle] ADJ

1. impenetrable:

impenetrable (inaccesible)
undurchdringlich
impenetrable (persona)
unzugänglich

2. impenetrable (impermeable):

impenetrable
undurchlässig

3. impenetrable (incomprensible):

impenetrable
undurchsichtig
impenetrable
undurchschaubar

4. impenetrable (insondable):

impenetrable
unerforschlich
impenetrable
unergründlich
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