“Not so fast!” Crossword Clue

If you’ve landed here for the “”Not so fast!”” clue from the October 30 2025, Washington Post mini crossword, you are in the exact right place. Our team of experts has solved today’s entire puzzle and found the precise answer for this clue.

The 4-letter answer to this puzzle is WHOA. An exclamation used to command a horse to stop or to express surprise or astonishment.

The clue 'Not so fast!' is an exclamation used to tell someone to stop or slow down, which matches the meaning of 'WHOA.' This word is often used as a command to halt a horse, but it has also entered common language as a way to express surprise or to interrupt rapid movement.

You can find all the solutions for today’s puzzle, as well as answers from previous days, on our main Washington Post Mini Crossword Answers Today (September 2026) page.

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