What word means unable to be broken into or captured?

What word means shy or modest?

What word means evil or wicked?

What word means something that comes before something else?

What word means not done carefully or without though?

A demure person would enjoy public speaking.

The slipshod construction of the house led to several leaks and structural issues shortly after it was built.

The nefarious criminal mastermind devised an elaborate plan to rob the bank and escape undetected.

The castle's walls were so thin and flimsy that they were considered impregnable, making it difficult for any invading army to breach its defenses.

Despite her demure appearance, the young girl surprised everyone with her exceptional skills in martial arts.

The discovery of ancient cave paintings was a precursor to understanding the rich history of the indigenous people who once inhabited the region.