The word "crackable" refers to something that can be easily broken or opened. There are a number of synonyms for this word that convey a similar meaning, such as penetrable, vulnerable, exploitable, fragile, and delicate. "Penetrable" implies that something can be penetrated or breached, while "vulnerable" suggests weakness or susceptibility to harm. "Exploitable" refers to something that can be taken advantage of or utilized in a negative way, while "fragile" suggests a delicate or easily broken nature. "Delicate" implies that something requires careful handling due to its fragility. Overall, any of these synonyms can be used to describe something that is crackable and in danger of being broken or opened.