im-pregnable = cannot be made pregnant
, In early days there used to be iron clothings around chaste maidens' waste so that they can not be made pregnant by strangers.
thus these women were impregnable= invulnerable
im-'not'+pregnable sounds similar to pregnant.so if u are pregnant u cant withstand attacks and if u are IMPREGNABLE you are ABLE TO WITHSTAND ATTACK
Im+Pregnable= read like not+pregnant. When women are pregant,they become vulnerable to death. so impregnable means invulnerable
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