'Impenetrable' definitions:
Definition of 'impenetrable'
From: WordNet
adjective
Not admitting of penetration or passage into or through; "an impenetrable fortress"; "impenetrable rain forests" [ant: penetrable]
adjective
Permitting little if any light to pass through because of denseness of matter; "dense smoke"; "heavy fog"; "impenetrable gloom" [syn: dense, heavy, impenetrable]
adjective
Impossible to understand; "impenetrable jargon"
Definition of 'Impenetrable'
From: GCIDE
- Impenetrable \Im*pen"e*tra*ble\, a. [L. impenetrabilis; pref. im- not + penetrabilis penetrable: cf. F. imp['e]n['e]trable.]
- 1. Incapable of being penetrated or pierced; not admitting the passage of other bodies; not to be entered; impervious; as, an impenetrable shield. [1913 Webster]
- Highest woods impenetrable To star or sunlight. --Milton. [1913 Webster]
- 2. (Physics) Having the property of preventing any other substance from occupying the same space at the same time. [1913 Webster]
- 3. Inaccessible, as to knowledge, reason, sympathy, etc.; unimpressible; not to be moved by arguments or motives; as, an impenetrable mind, or heart. [1913 Webster]
- They will be credulous in all affairs of life, but impenetrable by a sermon of the gospel. --Jer. Taylor. [1913 Webster]
Synonyms of 'impenetrable'
From: Moby Thesaurus
- 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,
- Greek to one,
- 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