impenetrable
Impossible to breach
Impenetrable describes something that cannot be passed through or entered.
An impenetrable fortress resists assault; an impenetrable jungle blocks passage.
The word extends to abstractions: an impenetrable mystery defies understanding, an impenetrable expression reveals nothing.
His accent was so thick as to be impenetrable.
Something impenetrable to light, reason, or bullets simply won't let it through.
Impervious to moisture
- sealedClosed to prevent entry
- hermeticImpenetrably closed off
- watertightPrevents liquid from passing
- airtightImpervious to atmosphere
impermeable · resistant · weatherproof · bulletproof · shielded · coated · membrane · barrier
Handheld defensive armor
- armorProtective combat covering
- wallVertical enclosing structure
- membraneThin tissue sheet
- hullOuter covering or frame
shell · carapace · hide · coating · seal · casing · plating · cladding
Heavily defended military structure
- citadelFortified urban stronghold
- strongholdFortified place of defense
- bastionFortified defensive position
- rampartFortified defensive wall
castle · bunker · bulwark · battlements · palisade · stockade · redoubt · keep
Fixed, intent look
- expressionConveyed thought or feeling
- stareProlonged fixed gaze
- facadeDeceptive outward appearance
- demeanorOutward manner, conduct
countenance · visage · mask · sphinx-like · inscrutable · unreadable · enigmatic · stoic
Having great depth
- overgrownExcessively covered in vegetation
- lushRichly abundant in growth
- tangledTwisted confusedly together
- undergrowthLow forest vegetation
thicket · jungle · bramble · foliage · canopy · vegetation · matted · impassable
Specialized professional vocabulary
- legaleseAttorneys' technical jargon
- bureaucrateseWordy governmental language
- treatiseFormal scholarly composition
- dissertationExtended academic treatise
thesis · tome · manuscript · doctrine · dogma · theory · discourse · technical
Transformed into cipher
- firewallNetwork access control system
- vaultSecure storage chamber
- passwordAuthentication string
- authenticationConfirming genuine identity
cybersecurity · safeguarded · locked · protected · fortified · uncrackable · ciphertext · encoded
waterproof
Impervious to moisture
- sealedClosed to prevent entry
- hermeticImpenetrably closed off
- watertightPrevents liquid from passing
airtight · impermeable · resistant · weatherproof · bulletproof · shielded · coated · membrane · barrier · rainproof
shield
Handheld defensive armor
hull · shell · carapace · hide · coating · seal · casing · plating · cladding · skin
fortress
Heavily defended military structure
- citadelFortified urban stronghold
- strongholdFortified place of defense
- bastionFortified defensive position
rampart · castle · bunker · bulwark · battlements · palisade · stockade · redoubt · keep · barbican
gaze
Fixed, intent look
- expressionConveyed thought or feeling
- stareProlonged fixed gaze
- facadeDeceptive outward appearance
demeanor · countenance · visage · mask · sphinx-like · inscrutable · unreadable · enigmatic · stoic · impassive
thick
Having great depth
- overgrownExcessively covered in vegetation
- lushRichly abundant in growth
- tangledTwisted confusedly together
undergrowth · thicket · jungle · bramble · foliage · canopy · vegetation · matted · impassable · trackless
jargon
Specialized professional vocabulary
- legaleseAttorneys' technical jargon
- bureaucrateseWordy governmental language
- treatiseFormal scholarly composition
dissertation · thesis · tome · manuscript · doctrine · dogma · theory · discourse · technical · academic
encrypted
Transformed into cipher
authentication · cybersecurity · safeguarded · locked · protected · fortified · uncrackable · ciphertext · encoded · scrambled
- Darknessblackness, pitch black, pitch-black, inkiness, murk
- durabilitytoughness, durable, sturdiness, robustness, sturdy
- mysteriousmysterious, cryptic, enigmatic, arcane, obscure
- beyond reachunattainable, unreachable, inaccessible, out of bounds, elusive
- complexitycomplex, complicated, simple, intricate, easy
- inaccessibleinaccessible, unreachable, out of reach, unobtainable, unattainable
impenetrablepermeable
Allowing substances through
porous · penetrable · pervious · absorbent · leaky
impenetrableclear
Without obstruction or fog
understandable · comprehensible · intelligible · accessible · lucid