A gridiron is a football field. The word gridiron is also sometimes used to refer to a grate for broiling food (as in “put the steaks on the gridiron”) or something consisting of or covered with a network (as in “a gridiron of streets and avenues”).

// The book recounts the quarterback’s most glorious moments on the gridiron.

Someone or something ensconced is firmly placed or hidden. Ensconce can be a synonym of shelter and conceal, or of establish and settle.

// The sculpture is safely ensconced behind glass.

// He ensconced himself in the library's back room for the afternoon.

Cronyism is the unfair practice by a powerful person (such as a politician) of giving jobs and other favors to friends without regard for their qualifications.

// City residents are pushing back against cronyism and corruption in their local government.

Something described as Byzantine (or Byzantine) is very complicated, secret, and hard to understand. In its most literal (and always capitalized) sense, Byzantine describes that which is "of, relating to, or characteristic of the ancient city of Byzantium."

// The company's byzantine accounting practices have gotten it into trouble with the government.

// Works of Byzantine art filled the gallery's walls.

Clement is a formal word used to describe weather that is mild, or in other words, neither too hot nor too cold. Clement is also sometimes used to describe someone who is inclined to be merciful or lenient, as in “a clement judge.”

// Although she loves visiting the northeast, Sue prefers to live in places with a more clement climate, without heavy snows or high heating bills.

To lollygag is to spend time doing things that are not useful or serious, or in other words, to fool around and waste time.

// Stop lollygagging and get to work!

// The player was kicked off the team for lollygagging during practice.

Propinquity is a formal word that typically refers to nearness in place or time, making it a synonym of proximity. It can also be used as a synonym of kinship to refer to the state of being related to others by blood.

// The geographical propinquity of these ancient cultures explains many of the architectural similarities.

Fallacious is a formal word that typically describes something, such as an argument or assumption, that is false or inaccurate and that tends to mislead or deceive others. // The notion that disease is caused by malign spirits was known to be fallacious long before the advent of germ theory.