I have a similar question to this, except for Sphinx and RST. Namely, I would like to prevent text from being hyphenated at the end of the line.
For example I want this:
Hyphenation is implemented by the stylesheet basic.css in the Sphinx theme "basic".
div.body p, div.body dd, div.body li, div.body blockquote {
-moz-hyphens: auto;
-ms-hyphens: auto;
-webkit-hyphens: auto;
hyphens: auto;
}
You can override these styles with your own. See my answer to How do I customize Sphinx RtD Theme default search settings?
Your theme may have JavaScript or other styles that implement hyphenation.
For PDF output, see https://tex.stackexchange.com/a/5039