impervious
- adjective (adj)
Meaning: unable to be penetrated
Synonyms:
closed to
hermetic
immune
impassable
impassive
impenetrable
impermeable
imperviable
inaccessible
invulnerable
resistant
sealed
tight
unaffected
unapproachable
unmoved
unpierceable
unreceptive
watertight
Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.