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We found 31 dictionaries with English definitions that include the word impenetrable:
Click on the first link on a line below to go directly to a page where "impenetrable" is defined.

General (27 matching dictionaries)

1. impenetrable: Merriam-Webster.com [home, info]
2. impenetrable: Oxford Dictionaries [home, info]
3. impenetrable: American Heritage Dictionary of the English Language [home, info]
4. impenetrable: Collins English Dictionary [home, info]
5. impenetrable: Vocabulary.com [home, info]
6. impenetrable: Macmillan Dictionary [home, info]
7. Impenetrable, impenetrable: Wordnik [home, info]
8. impenetrable: Cambridge Advanced Learner's Dictionary [home, info]
9. impenetrable: Wiktionary [home, info]
10. impenetrable: Webster's New World College Dictionary, 4th Ed. [home, info]
11. impenetrable: The Wordsmyth English Dictionary-Thesaurus [home, info]
12. impenetrable: Infoplease Dictionary [home, info]
13. Impenetrable, impenetrable: Dictionary.com [home, info]
14. impenetrable: UltraLingua English Dictionary [home, info]
15. impenetrable: Cambridge Dictionary of American English [home, info]
16. Impenetrable: Online Plain Text English Dictionary [home, info]
17. impenetrable: Webster's Revised Unabridged, 1913 Edition [home, info]
18. impenetrable: Rhymezone [home, info]
19. impenetrable, impenetrable, impntrable: AllWords.com Multi-Lingual Dictionary [home, info]
20. impenetrable: Webster's 1828 Dictionary [home, info]
21. impenetrable: Free Dictionary [home, info]
22. impenetrable: Mnemonic Dictionary [home, info]
23. impenetrable: WordNet 1.7 Vocabulary Helper [home, info]
24. impenetrable: LookWAYup Translating Dictionary/Thesaurus [home, info]
25. impenetrable: Dictionary/thesaurus [home, info]

Business (1 matching dictionary)

26. impenetrable: Legal dictionary [home, info]

Computing (1 matching dictionary)

27. impenetrable: Encyclopedia [home, info]

Medicine (1 matching dictionary)

28. impenetrable: online medical dictionary [home, info]

Slang (1 matching dictionary)

29. Impenetrable: Urban Dictionary [home, info]

(Note: See impenetrably for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (impenetrable) ▸ adjective:  not admitting of penetration or passage into or through ("An impenetrable fortress") ▸ adjective:  impossible to understand ("Impenetrable jargon") ▸ adjective:  permitting little if any light to pass through because of denseness of matter ("Impenetrable gloom") ▸ Also see impenetrably ▸ Words similar to impenetrable ▸ Usage examples for impenetrable ▸ Popular nouns described by impenetrable ▸ Words that often appear near impenetrable ▸ Rhymes of impenetrable ▸ Invented words related to impenetrable