Someone who's no-nonsense is very efficient and businesslike. If you're extremely practical and don't see the point of wasting time, you're no-nonsense.

Some teachers like to joke around with students, while others are much stricter than that — they are stern and no-nonsense. A brand new English teacher might resolve to start using more no-nonsense techniques in the classroom if he realizes his class isn't getting quite enough accomplished. The adjective no-nonsense was first used in 1920s sporting slang, originally in the phrase "to stand to no nonsense."

Definitions of no-nonsense

adj not tolerating irrelevancies

“the no-nonsense tones of a stern parent”
straightforward in means or manner or behavior or language or action

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