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impenetrable

How to pronounce impenetrable:

Synonyms for impenetrable:

close
compact
dense
hermetic
impassable
impassible
impermeable
impervious
impregnable
inviolable
solid
sturdy
substantial
thick
tight
uncomprehensible
unpierceable

Antonyms for impenetrable:

accessible
comprehensible
enterable
holey
knowable
leaky
negotiable
open
passable
penetrable
permeable
pervious
pierceable
porous
semipermeable
soft
thin
traveled
travelled
vulnerable
Other 5-syllable words

Here are some other common 5-syllable words.

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