@Gosertje Hardstikke mooi!
The Pocketbook converter strips most tagging. Only bold and italics remain, IIRC. If the font size can be reduced, it will have to be done within the Pocketbook environment.
Of course, you could install Koreader....It allows you to change font size, font face and you can even add your custom styling, it you want. The Pocketbook dictionary format is a very basic format. If you want more negative adjectives, you'll only have to search this forum.