Tomfoolery is a word with an old-fashioned sound to it that refers to playful or silly behavior.

// The antics in the play itself apparently inspired tomfoolery behind the scenes as well, as cast members constantly played practical jokes on one another.

Otiose is a formal word typically used to describe either something that serves no useful purpose, or something that has no use or effect.

// I enjoyed the storyline, but was bothered by the otiose punctuation.

// The new zoning regulations rendered their proposal for the empty lot otiose.

to become vague, indistinct, or nebulous

Limpid describes things that are perfectly transparent or clear, or that are simple in style.

// Though the stream was deep, flecks and shimmers in the sand shone up through its limpid water.

// The author is known for her limpid, exacting prose.

Respite refers to a short period of time when someone is able to stop doing something that is difficult or unpleasant, or when something difficult or unpleasant stops or is delayed.

// The long weekend provided a nice respite from the pressures of her job.

// The station's meteorologist had predicted that the bad weather would continue through the week without respite.

any secluded place of residence or habitation; retreat; hideaway

Someone described as swole is extremely muscular. In other words, they have a physique enhanced by bodybuilding exercises.

// Her New Year’s resolution was to get swole, so she signed up with a personal trainer and committed to working out every day.

Castigate is a formal word that means "to criticize harshly."

// He was widely castigated for earning millions of dollars in bonuses as the company he was leading slid into insolvency.

Patriot refers to a person who loves and strongly supports or fights for their country.

// Addy enjoyed looking at old photographs of her grandmother, a patriot who served in the Women’s Army Auxiliary Corps during World War II, in uniform.