“Insouciant” can be remembered as “In + Soup + Ant”. Imagine an ant floating around in a bowl of soup with no care. It is just happy in a casual way. Nothing concerns it because it has food! Remember thus.
Memorize and Learn the Usage of the Word: SEQUESTER
Imagine a mighty warrior secluding herself in her living quarters from others in her village before she goes out seeking quests. Thus, remember the word “Sequester” as a combination of Seclusion Quarters + Seek Quest. Remember thus.
Memorize and Learn the Usage of the Word: QUARANTINE
The word “Quarantine” should remind you of “Quarter”, which is used to refer to rooms or lodgings, especially those allocated to people in military or domestic service. Imagine a large number of people who have been kept separate in quarters, which would mean that the people are in a quarantine. Remember thus.