Answer: 1. destabilize ----> to make a nation lose face with its people, thereby causing its downfall.
2. détente ----> a lessening of mistrust or hostility between two people or nations.
3. inadvertent ---> something done by accident or without malice.
4. rift ---> a breaking- or splitting-up between two friends.
5. stagnant ---> to stand still or be unmoving.
Explanation:<u> "Destabilize" means to cause instability.</u> In most cases, this word is used to refer to the functioning of a government. On the other hand, <u>"détente"</u> makes reference to <u>an improvement in the relationship that exists between two nations</u>. It has been mainly used to describe a phase in the Cold War. Moreover, <u>"inadvertent</u>" is an adjective that <u>depicts an action as unintentional</u>, that is to say as done by accident, and <u>"rift"</u> is a noun that refers to<u> a strong disagreement between two people which causes a splitting-up.</u> Finally,<u> "stagnant"</u> is used to describe a situation or a business that <u>shows little or no activity at all.</u> Therefore, "stagnant" describes something that does not grow.