Superfluous is a formal word used to describe things that exceed what is necessary or sufficient, or that are simply not needed.

// Further discussion seems superfluous, given the thorough conversation we just had.

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“On the final single from his album Manning Fireworks, MJ Lenderman sketches a character study of a man so preoccupied with superfluous status symbols that he finds himself totally isolated from the world.” — Arielle Gordon, Pitchfork, 2 Dec. 2024

If, say, you were to go chasing waterfalls in addition to the rivers and the lakes that you’re used to, such a pursuit would be superfluous. In other words, you would be exceeding what is necessary to satisfy your need for water-based enjoyment and recreation. “You’ve already got rivers and lakes,” your friends might advise with a bit of TLC, “just stick to them!” “Extra water” is also key to understanding the history of the word superfluous, which entered Middle English from the Latin adjective superfluus, meaning literally “running over.” Superfluus, in turn, comes from the verb superfluere (“to overflow”), which combines the prefix super- (meaning “over”) and fluere, “to flow.” In addition to influencing superfluous, fluere also flowed into the English words affluent, influence, and fluid, among others.