impenetrable

[ im-pen-i-truh-buhl ]
/ ɪmˈpɛn ɪ trə bəl /

adjective

not penetrable; that cannot be penetrated, pierced, entered, etc.
inaccessible to ideas, influences, etc.
incapable of being understood; inscrutable; unfathomable: an impenetrable mystery.
Physics. possessing impenetrability.

QUIZZES

CHALLENGE YOURSELF WITH THIS MIDDLE SCHOOL PART OF SPEECH QUIZ!

How well do you know your adjectives from your adverbs? Your preposition from your pronouns? Your interjections from your conjunctions? Let’s put your knowledge of parts of speech to the text! Note: Many of the following questions will ask you to identify the parts of speech “in order.” That means the first word in all capital letters will correspond to the first option in an answer, and so on.
Question 1 of 10
In order, what parts of speech are the words in all capital letters? Alisa was VERY tired, SO she decided to go to bed.

Origin of impenetrable

1425–75; late Middle English impenetrabel < Latin impenetrābilis. See im-2, penetrable

SYNONYMS FOR impenetrable

ANTONYMS FOR impenetrable

OTHER WORDS FROM impenetrable

im·pen·e·tra·ble·ness, nounim·pen·e·tra·bly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for impenetrably

British Dictionary definitions for impenetrably

impenetrable
/ (ɪmˈpɛnɪtrəbəl) /

adjective

incapable of being pierced through or penetratedan impenetrable forest
incapable of being understood; incomprehensibleimpenetrable jargon
incapable of being seen throughimpenetrable gloom
not susceptible to ideas, influence, etcimpenetrable ignorance
physics (of a body) incapable of occupying the same space as another body

Derived forms of impenetrable

impenetrability, nounimpenetrableness, nounimpenetrably, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012