Exact Match:
- impenetrable
- impossible to understand; "impenetrable jargon"
- not admitting of penetration or passage into or through; "an impenetrable fortress"; "impenetrable rain forests"
Synonyms:
- Greek to one,
- ambiguous,
- arcane,
- beyond reach,
- beyond understanding,
- cabalistic,
- close,
- close-knit,
- close-textured,
- close-woven,
- closed forever to,
- closed to,
- compact,
- compacted,
- compressed,
- concentrated,
- concrete,
- condensed,
- congested,
- consolidated,
- crammed,
- crammed full,
- crowded,
- dense,
- exuberant,
- firm,
- flourishing,
- gluey,
- gross,
- hard,
- heavy,
- holeproof,
- impassable,
- impermeable,
- impervious,
- impregnable,
- inaccessible,
- inarticulate,
- incognizable,
- incoherent,
- incomprehensible,
- incontestable,
- indomitable,
- inexpugnable,
- inscrutable,
- insuperable,
- invincible,
- inviolable,
- invulnerable,
- irresistible,
- jam-packed,
- jammed,
- jungled,
- jungly,
- lost to,
- lush,
- luxuriant,
- massive,
- mystic,
- nonporous,
- nonpuncturable,
- numinous,
- out of reach,
- overgrown,
- overpowering,
- overrun,
- overwhelming,
- packed,
- past comprehension,
- punctureproof,
- rambling,
- rank,
- resistless,
- riotous,
- serried,
- solid,
- substantial,
- thick,
- thick-growing,
- thickset,
- un-come-at-able,
- unaccessible,
- unaccountable,
- unapproachable,
- unassailable,
- unattainable,
- unavailable,
- unbeatable,
- unconnected,
- unconquerable,
- undiscoverable,
- unfathomable,
- ungettable,
- ungraspable,
- unguessed,
- unintelligible,
- unknowable,
- unobtainable,
- unpassable,
- unperforable,
- unpierceable,
- unprocurable,
- unreachable,
- unsearchable,
- unsecurable,
- unsubduable,
- unsurmountable,
- unweeded,
- unyielding,
- viscid,
- viscose,
- viscous,
- weed-choked,
- weed-ridden,
- weedy