impenetrably
Adverb
Meaning
In an impenetrable manner or state; imperviously.
Source: Webster's dictionarySynonyms
inexplicably
abstractly
ambiguously
darkly
obscurely
chaotically
enigmatically
cryptically
confusedly
arduously
inarticulately
hazily
murkily
abstrusely
inscrutably
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Antonyms
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Edward Kennedy “Duke” Ellington was the greatest jazz composer of the twentieth century—and an impenetrably enigmatic personality whom no one, not even his closest friends, claimed to understand.
Yang gazed out impenetrably from the shade of his newsboy cap.
At that time she seemed almost impenetrably cool.