Synonyms & related words for impenetrable

Find synonyms, related words, and the definition of impenetrable — including dense, impregnable, impermeable, inexpugnable, inscrutable, impervious. Dendril is a free visual thesaurus that shows them on an interactive map where stronger matches sit closer to the center — no signup, no ads.

Words related to impenetrable

Explore words related to impenetrable — words associated with it, words that go with it, and its nearest matches in meaning. Related words include impenetrableness, impenetrably, imperviously, impregnableness, impermeably, impenetrability, impregnably, penetrable. Click any word to make it the center of the map and keep exploring the web of connections.

Synonyms for impenetrable

Common synonyms for impenetrable include dense, impregnable, impermeable, inexpugnable, inscrutable, impervious, incomprehensible, impassable — words that share a close meaning. Hover or tap any word on the map for its definition and part of speech.

Where does impenetrable come from?

The word impenetrable breaks down into one root of Latin origin: the root penetr-, from Latin penetro (“to enter, pierce”). Explore each root to see other English words built from the same source.