Balmy is an adjective that is often used to describe weather that is warm, calm, and pleasant. It can also be used to describe someone or something (such as an idea) that is foolish or irrational.

// After a long, eight-hour drive, we were rewarded with a mild, balmy evening at our vacation spot on the shores of Lake Erie.

// Despite being a devout Green Bay fan, she finds the idea of attending games in head-to-toe yellow and green body paint to be a bit balmy.

An oxymoron is a combination of words that have opposite or very different meanings, such as "cruel kindness" or "open secret." In broader usage, oxymoron can also refer to something (such as a concept) that is made up of contradictory or incongruous elements.

// Some of Shakespeare's most famous plays are filled with oxymorons such as "loving hate" and "tragical mirth."

Something or someone described as lackadaisical is lacking in interest, enthusiasm, or zest.

// Feeling particularly lackadaisical in the summer heat, they lazily tossed a ball back and forth.

To circumscribe something is to limit its range or activity.

// The president’s decision-making power was carefully circumscribed by the company’s board.

Vacuous is a formal word indicating a lack of thought, intelligence, or substance.

// Despite a lengthy advertising campaign pitching the film as a masterwork, critics ultimately assailed it as dull and filled with self-important characters spouting vacuous platitudes.

In military contexts, salvo refers to various actions involving discharge or release of bombs, rockets, artillery, etc., as well to the bombs or projectiles released in such an action. In general use, salvo is usually used to refer to a strong or sudden verbal attack, but it can also refer to a sudden occurrence of applause, laughter, etc., from many people.

// The troops were driven back by a salvo of cannon fire.

// The editorial's opening salvo was a list of grievances against the mayor's policies.

// The conclusion of her performance was answered with a salvo of cheers and applause.

Gnomic is a formal word that describes something cryptically said or written in few words.

// The painter is notorious for offering terse, gnomic responses to questions about her work that leave interviewers and critics scratching their heads.

Pedagogical is a formal word used to describe things that are of or related to teachers or education.

// The new professor is known for particularly engaging pedagogical methods.