Question

What's the longest word in the English language with only one vowel repeated?

Answer 1

Strengthlessnesses, eighteen letters long, is the longest word in the English language with only one vowel repeated.

Answer 2

The longest word in English with only one vowel is Strengths, but with repetition it will be  Chrononhotonthologos, but if you are talking about the riddle it will be Language; p