impenetrable

1. 1.

   not admitting of penetration or passage into or through

   “an impenetrable fortress”

   “impenetrable rain forests”

   Antonymspenetrable

   Similardense
2. 2.

   permitting little if any light to pass through because of denseness of matter

   “dense smoke”

   “heavy fog”

   “impenetrable gloom”

   Synonymsdenseheavy

   Similarthick
3. 3.

   impossible to understand

   “impenetrable jargon”

   Similarincomprehensible

Questions about impenetrable

What does impenetrable mean?

impenetrable means "not admitting of penetration or passage into or through". That is the primary sense; the word has 3 in total, listed in full on this page.

How many syllables are in impenetrable?

impenetrable has 5 syllables: im-pen-e-tra-ble. The stress falls on "pen". In IPA it is /ˌɪmˈpɛnətɹəbəl/.

What is another word for impenetrable?

Close synonyms include dense, heavy. Each sense on this page lists its own synonyms, because a word with several meanings rarely has one substitute that works for all of them.

What is the opposite of impenetrable?

The recorded antonyms are penetrable.

Is impenetrable a common word?

impenetrable is banded "Familiar" — widely understood, used when the subject calls for it. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.