Synonyms and related words :
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