That woul be a bug in the Qt webkit rendering engine common to the calibre viewer and Sigil. As far as I know, there is no easy fix for this. Normally I'd have told you to enable the hyphenation in the calibre viewer, but another bug in Qt webkit means that soft hyphens are not rendered at a line break, which makes hyphenation useless.
ou just have to wait for Nokia to get around to fixing these bugs (which were reported to them over two years ago).
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