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im·pen·e·tra·ble

impenetrable

 
 
pronunciation:
ihm pe n tr bl
features:
Word Combinations (adjective)
part of speech: adjective
definition 1: impossible to penetrate or enter; impervious.
The cave was narrow and impenetrable by humans.
synonyms:
impassable, impermeable, impervious
antonyms:
penetrable, permeable
similar words:
blocked, dense, inaccessible, proof, unapproachable
definition 2: impossible to understand; incomprehensible.
What became of the crew remains an impenetrable mystery.
synonyms:
incomprehensible, inscrutable, unfathomable
antonyms:
clear, intelligible, knowable, penetrable, self-explanatory
similar words:
abstruse, dense, elusive, inexplicable, insoluble, mysterious, undecipherable
definition 3: impossible to influence; immovable.
synonyms:
immovable, impervious
antonyms:
flexible
similar words:
inflexible, intractable, rigid, unreceptive, unyielding
Word Combinations  About this feature
adverb + (adj.)impenetrable absolutely, almost, deep, essentially, largely, mostly, nearly, otherwise, seemingly, supposedly, virtually
(adj.)impenetrable + adverb but
(adj.)impenetrable + noun armor, barrier, blackness, border, boundary, branch, bureaucracy, cloak, cloud, curtain, darkness, defense, depth, encryption, fog, forest, grass, hedge, ice, interior, jungle, mass, maze, missile, mystery, prose, rain, secret, shadow, shield, silence, smoke, solidity, stare, surface, swamp, tangle, thicket, umbrella, undergrowth, valley, wall, wood [See all][See only the most frequent]
derivations: impenetrably (adv.), impenetrability (n.), impenetrableness (n.)