Relevance
Relevance ranks synonyms and suggests the best matches based on how closely a synonym’s sense matches the sense you selected.
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Complexity
Complexity sorts synonyms based on their difficulty. Adjust it higher to choose from words that are more complex.
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Length
Length ranks your synonyms based on character count.
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Common words appear frequently in written and spoken language across many genres from radio to academic journals.
Informal words should be reserved for casual, colloquial communication.
noun bulk, mass
See more synonyms for density

Antonyms for impenetrability

Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.
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