(Latin: penetrare, penetratus, to go into, to enter, to pierce; to pass through, to pass into; a place within)
The thorny branches made a thick, impenetrable hedge around Helena's house.2. A reference to something that is inconceivable to understand or to explain: Lee was reading about what the police declared to be an impenetrable crime.
The students couldn't comprehend the teacher's impenetrable explanation of the mathematical processes.3. Not open to ideas, impressions, influences, etc.: Ingrid had an impenetrable mind and so she would not change her opinions regarding how to proceed with the project.
4. Etymology: borrowed through Middle French impenetrable; from Latin impenetrabilis, from im-, "not, opposite of", a variant of in- before p + penetrabilis, "put into, get into, enter into".
2. A reference to something that is beyond one's power to discern: As a reporter, Shelby was having a problem interviewing the more impenetrably non-English speaking refugees.
2. Having or showing an ability to figure out things clearly and fully: Dr. Rosetta Bradley had penetrable insights regarding the medical condition of her patient.
The holy of holies was the penetralia of the Jewish Temple or the sanctuary that consisted of the innermost chamber of the Tabernacle in the temple of Solomon where the Ark of the Covenant was kept.
2. A compound that goes through or into something: The pharmacist recommended a lotion for Leon's skin that could function as a penetrant to relieve the itching.
3. A large capsule that discharges and injects a toxic fluid: The jellyfish uses a penetrant containing a barbed, threadlike tube, that delivers a paralyzing sting into its attackers or prey.
A penetrant liquid is one that usually contains a dye or fluorescent chemical which, when poured over a metal surface, determines the existence of cracks.
The nails easily penetrated the soft wood when Kyle was working on his carpentry project.
The odor of garlic penetrated the entire apartment when Debora was cooking.2. To force one's way in, go into, or to pass through: Melvin's eyes couldn't penetrate the darkness.
Even where the trees were thickest, the sunshine still penetrated through the leaves.3. To get into an enemy group or rival organization to obtain information or to influence some kind of changes: Polly and Helena decided to penetrate the political group so they could find out what the organization was planning against their opposition.
The government fears that there are informers who are penetrating the special military department so they can publicize its secret activities.4. To succeed in fathoming or gaining insight into something complex or mysterious: John, the biologist, apparently was able to penetrate the mysteries of nature.
2. Sharp-witted, perceptive, showing insight, or discerning: As a reporter, Eugenia was making a penetrating study of the political proposals of the two candidates.
Susana made penetrating criticisms about her company's labor policies.