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impenetrable

im·pen·e·tra·ble

impenetrable

 
pronunciation:
ihm pe n tr bl
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
derivations: impenetrably (adv.), impenetrability (n.), impenetrableness (n.)