impenetrable
词形变化：
副词: impenetrably | 名词: impenetrableness |
同义词：
dense | impassable | unintelligible | inaccessible | unapproachable | unclear | obscure | vague | abstruse | deep | enigmatic | thick | solid | impermeable | dark | incomprehensible | unsolvable | unfathomable | indecipherable | inscrutable | cryptic | heavy |
反义词：
词义辨析：
同义:
a.不能穿过的; 难接近的
unapproachable
inaccessible
impassable
dense
a.不易了解的
obscure
unclear
vague
unintelligible
同义参见:
abstruse
enigmatic
deep