Or enter known letters “Mus?c” (? for unknown)

“Prove oneself fallible”

Here is the verified answer to the Wall Street Journal Crossword clue “Prove oneself fallible”, last seen on October 21, 2026.

Answer hidden — reveal below
E?R

A 3-letter across entry from the Wednesday puzzle

The Answer
ERR

The answer to “Prove oneself fallible” is ERR

Letters3
DirectionAcross
PublishedOct 21, 2026

Letter analysis

The clue “Prove oneself fallible” appeared in the Wall Street Journal Crossword on Wednesday, October 21, 2026 as a across entry. The verified answer is ERR — a 3-letter word that begins with E and ends with R.

This answer contains 1 vowel and 2 consonants. Click through any related clue below to keep solving, or open the full answer key for the day from the link above.

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Frequently Asked Questions

What is the answer to “Prove oneself fallible”?

The answer to the Wall Street Journal Crossword clue “Prove oneself fallible” is ERR — a 3-letter across entry from the October 21, 2026 puzzle.

How many letters is the answer?

ERR has 3 letters — 1 vowel and 2 consonants.

Are these answers official?

WSJCrosswordAnswers.org is an independent reference site, not affiliated with the Wall Street Journal. We solve and verify each puzzle by hand before publishing.