Something, such as a plaque, statue, or parade, is said to commemorate an event, person, etc. when it serves as a memorial; it exists or is done in order to recall the event or person. A person or group commemorates an event, person, etc. by doing something special in order to remember and honor that event or person.

// The plaque commemorates the battle that took place here 200 years ago.

// Each year on this date we commemorate our ancestors with a special ceremony.

A bastion is a place or system in which something (such as an idea) is protected and continues to survive.

// The restaurant is a bastion of the region’s ancient culinary traditions.

Someone may be described as voluble if they are talking a lot in a rapid, energetic way.

// Bri knew something was bothering her normally voluble friend when he was reluctant to talk about his day.

Chagrin refers to a feeling of frustration or annoyance caused by failure or disappointment.

// I decided to take a gap year to the chagrin of my parents.

Antithetical typically describes something that is in direct and unambiguous opposition to another thing. It is often used with to.

// The district's new policy is fundamentally antithetical to the school's values.

a person who is extremely neat about their surroundings or appearance

Junket refers to a trip that is paid for by someone else, such as a promotional trip made at another's expense, or an official's trip made at public expense.

// The cast of the widely-acclaimed movie is making press junkets to major cities.

Impervious describes that which does not allow something (such as water or light) to enter or pass through. It is also used formally to mean “not bothered or affected by something.” Both senses of impervious are usually used with to.

// The material is impervious to water.

// The mayor seems impervious to criticism.