To jilt someone is usually to abruptly end a romantic relationship with them. Jilt is also applied to various kinds of abrupt rejection.

// The novel begins with the hero, having just been jilted by his fiancée, setting off to hike the Appalachian Trail.

Compunction refers to a feeling of misgiving, that is, doubt or suspicion especially concerning a future event. It can also refer to a feeling of guilt or regret. The word is typically used in negative constructions.

// We moved ahead with the plans without compunction.

// They felt no compunctions about their crimes.

Fervid is used to describe people or things that express or are expressive of strong feelings.

// The core of the book is the fervid letters the friends exchanged during the years they were apart.

Outlandish can describe things that are strikingly strange or unusual; in this use, it’s a synonym of bizarre. Outlandish can also describe things, such as claims, rumors, and accusations, that go beyond reasonable limits or standards.

// One of the author’s greatest strengths is her ability to write outlandish characters whose quirks remain lodged in readers’ minds long after they’ve finished the book.

// When asked to back up his outlandish claims, the mayor quickly changed the subject, all but admitting that he had no proof for his allegations.

Deportment refers to the way in which one conducts oneself especially in a formal setting.

// The new students were instructed in proper dress and deportment.

To abscond is to leave, flee, or escape a place in secret and go into hiding. Often, someone is said to have absconded with something.

// It was mid-semester, when fantasies about absconding from school and leaving the stress of exams behind abound.

A nexus is a relationship or connection between people or things. Nexus can also refer to a connected group or series or to the center or focus of something.

// The cultural district serves as a nexus for art and cuisine.

Luddite refers to someone who is opposed to change, and especially to technological change.

// My friends call me a Luddite for refusing to use chat bots.