Approbation is a formal word that refers to praise or approval.

// Their plan to rewild portions of the city’s parks has won the approbation of the mayor.

By and large is another way of saying "in general" or "on the whole."

// By and large, I like the way things have gone.

The word dally has a number of meanings. To dally can be to physically linger or dawdle, or to waste time. Dally may also mean "to act playfully," especially in a romantic sense, or "to deal with something lightly or in a way that is not serious."

// Three members of the hiking group were dallying and didn't arrive at the overlook until others were already starting to head back to the trailhead.

// Alton has been dallying with the idea of starting a bakery.

A nebula is a large cloud of interstellar gas or dust. In nontechnical use, the word nebula also refers to a galaxy other than the Milky Way.

// We were eventually able to see the nebula through the telescope.

Liminal is a formal word most often used to describe an intermediate state, phase, or condition. It can also describe something that is barely perceptible or barely capable of eliciting a response.

// The essay presents an image of the border region as a liminal zone where one culture blends into another.

Callow is a synonym of immature used to describe someone, especially a young person, who does not have much experience and does not know how to behave like an adult. Like the word immature, callow is often used disapprovingly.

// The novel’s plot involves a callow youth who eventually learns the value of hard work and self-reliance.

To fraternize with someone is to be friendly with them or to spend time with them in a friendly way. Fraternize is often, though not always, used in situations where such friendly behavior is considered wrong or improper, as in “fraternizing with the enemy.”

// The boss warned that fraternizing with the junior employees could be a risky career move for a manager.

Something described as chockablock is very full or tightly packed.

// Their mantel is chockablock with knickknacks collected from their travels to all fifty states.

Someone described as ambivalent has or displays very different feelings (such as love and hate) about someone or something at the same time.

// Aya was ambivalent about starting her first year away at college—excited for the new opportunities that awaited but sad to leave her friends and family back home.