Something may be described as flagrant if it is conspicuously bad—that is, too bad to be ignored.

// In a flagrant violation of the family's code of ethics, someone finished the ice cream and left the empty container in the freezer.

To validate something is to show that it is real or correct. Validate can also mean “to state or show that something is legal or official,” “to put a mark on something to show that it has been checked and is official or accepted,” and “to show that someone’s feelings, opinions, etc., are fair and reasonable.”

// The company’s claims about its latest product are yet to be validated.

// You can get discounted parking by having your parking garage ticket validated at the museum's ticket desk.

// The decline in sales only validated our concerns about the menu changes.

Something described as salient is very important or noticeable.

// The assignment was to write down the most salient points made in the article.

// One salient feature of the band's music is the variety of different genres it incorporates into a singular sound.

A euphemism is a mild or pleasant word or phrase that is used instead of one that is unpleasant or offensive.

// The HR department advises using the euphemism “let go” instead of saying that someone was fired.

Ostentatious describes someone or something that displays wealth, knowledge, power, etc., in a way that is meant to attract attention, admiration, or envy. Things that are ostentatious tend to stand out as overly elaborate or conspicuous.

// The resort town is famous for its extravagantly expensive summer homes, which some tourists view as impressive and others merely ostentatious.

To meander is to follow a winding or intricate course—that is, one with a lot of turns and curves—or to walk slowly without a specific goal, purpose, or direction.

// We spent the afternoon meandering around the seaside town.

// The river meanders through the canyon.

Immutable is a formal adjective used to describe something that is unable to be changed.

// It is hardly an immutable fact that cats and dogs are sworn enemies; over the years our golden retriever has grown both fond and protective of her tabby housemate.

Calculus refers to an advanced branch of mathematics that deals mostly with rates of change and with finding lengths, areas, and volumes. The word can also be used more broadly for the act of calculating—that is, estimating something by using practical judgment, or solving or probing the meaning of something.

// By my calculus the more efficient air conditioner will have paid for itself within a span of five years.