impregnable
adj. 坚不可摧的；不可战胜的
近义词：unassailable，invincible，unconquerable，strong，resistant，secure，impenetrable，invulnerable，indestructible，inviolable，conceptive，inexpugnable，unattackable，
英英释义
Adjective
- immune to attack; incapable of being tampered with;
"an impregnable fortress" "fortifications that made the frontier inviolable" "a secure telephone connection"
- capable of conceiving
- incapable of being overcome, challenged or refuted;
"an impregnable argument" "impregnable self-confidence"
例句
用作形容词(adj.)
- They will establish impregnable fortresses.他们将建造坚不可摧的城堡。
- The lofty walls of the castle seemed impregnable.这座城堡的高墙似乎坚不可摧。
- The lawyer won his case with an impregnable argument.律师以无可辩驳的论据打赢了那场官司。
- Only in this way can you be in an impregnable position for good.也只有这样，你才能永远立于不败之地。