impenetrable Definition

incomprehensible, thick, dense, heavy, uncomprehensible, inscrutable, opaque, unfathomable, watertight, inaccessible, obscure, insurmountable, impassable, insuperable, unintelligible, inconceivable, mysterious, inaudible, unclear, impregnable, impervious, penetrable, impermeable, indecipherable, indestructible, undecipherable, invisible, unbreakable, unmovable, bulletproof, unconquerable, inhospitable, unyielding, invincible, labyrinthine, unreadable, arcane, featureless, unforgiving, nebulous, barren, enigmatic, formless, abstruse, obtuse, unclimbable, porous, unscalable, omnipresent, cloaked, airtight, invulnerable, unstoppable, assailable, undistinguishable, otherworldly, untouchable, immovable, conquerable, fortified, impossible, suffocating, implacable, impierceable, crenelated, unnavigable, stygian, infallible, baffling, unflappable, multilayered, ironclad, adamantine, labyrinthian, unbendable, fearsome, devoid, maddening, unrecognizable, unsearchable, ringed, immutable, brittle, nonexistent, depthless, chinked, unreachable, nondescript, inexplorable, uncontainable, flimsy, useless, uninviting, jungly, indistinguishable, imperturbable, unremarkable, unanswerable, flawless, befuddled,