Anomaly is a somewhat formal word that refers to something that is remarkable in its deviation from what is usual or expected.

// Last summer’s storm was an anomaly for this area.

// We were unable to explain the anomalies in the test results.

To brandish something, such as a weapon, is to wave or swing it in a threatening or excited manner.

// Squeals of laughter erupted as three children brandishing squirt guns rounded the corner of the house.

1. all future generations

2. all of the offspring of a given ancestor

Lugubrious is a formal word used chiefly to describe something very sad, especially in an exaggerated or insincere way. The word can also describe something that shows or expresses gloom.

// The movie’s stunning cinematography could not make up for the lugubrious and plodding plot.

// The lugubrious mood of the room shifted when the voices of children playing erupted outside the window.

Enmity is a formal word that refers to a very deep unfriendly feeling, such as hatred or ill will, that is often felt mutually.

// Having to collaborate on the project only increased the bitter enmity between the two coworkers, who had never gotten along.

Rationale refers to an explanation or reason for something said or done. It is often used with for, behind, or of.

// City council members who oppose the zoning change should be ready to explain their rationale for voting against it.

// She’s explained the rationale behind her early retirement.

Jovial describes people as well as moods, attitudes, etc., that are cheerful and jolly. 

// The audience was in a jovial mood as the headlining comedian walked onto the stage.

a lively Polish dance with a moderately quick triple meter

Perpetuity refers to a state of continuing forever or for a very long time.

// The property will be passed on from generation to generation in perpetuity.