- impenetrable
- adj1. impervious, imperviable, impassable, unpassable, inaccessible, unaccessible, jungly, jungled, overgrown; trackless, pathless, wayless, untrodden, Obs. invious.2. proof, resistant, tight, snug, compact, hermetic, hermetically sealed; closed, shut, sealed, locked; solid, hard, rock-hard, adamantine; impermeable, unporous, nonporous, watertight, waterproof; punctureproof, imperforable, unperforable, imperforate, imperforated, unpierceable, unpierced, holeproof.3. dull, dense, thick, stolid, obtuse, stupid, senseless; crass, gross, indelicate, boorish, oafish; prejudiced, prejudicial, bigoted, biased, close-minded, narrow-minded; callous, calloused, insensitive, thickskinned, hard, hardened, indurate, indurated, inured, stony, flinty, steely; inflexible, rigid, fixed, unswayable, unmovable, unpliable, uninfluenceable, unpersuadable; impassive, indifferent, insensible, unfeeling, cold, unresponsive, unapproachable, unreachable, beyond reach, out of reach.4. unfathomable, inscrutable, incomprehensible, uncomprehensible, past or beyond comprehension, unknowable, beyond understanding, incognizable, indecipherable, undecipherable; profound, deep, recondite, esoteric, abstruse, abstract; mystic, mystical, occult, supernatural, preternatural, fey, otherworldly, supermundane; inexplicable, unexplainable, insolvable, insoluble, unaccountable, Obs. inextricable; puzzling, enigmatic, enigmatical; dark, obscure, dim, vague, nebulous; hidden, secret, mysterious.
A Note on the Style of the synonym finder. 2014.