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impenetrable

see definition of impenetrable

More words related to impenetrable

harder

adjective. rocklike

hardest

adjective. rocklike

impassable

adjective. closed

impervious

adjective. unable to be penetrated

impregnable

adjective. unyielding

incomprehensible

adjective. not understandable

incompressible

adjective. firm

indivisible

adjective. indissoluble

inscrutable

adjective. hidden, mysterious; blank
Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.
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