from linux.com "Scribus allows you to edit text directly in the text frame, but it also includes a so-called Story Editor, which is sort of a bare-bones word processor. It is, indeed, bare-bones: there is no WYSIWYG text editing, no spell checker, no other tools that Writer users take for granted. This leads to an obvious conclusion — do all the heavyweight editing in Writer before you import the document into Scribus."
It's dated info since many have linked dictionaries.
5 of my fixes were DOA because I didn't have the tabs/menus everyone else has.
Hunspell_EN is checkmarked by Scribus as intalled.
Many people say scribus wants anspell or other. From Linuxquestions.org:
"Fedora 25 Scribus 1.4.6 cannot use the libunspellplugin.so from Fedora 24 or from Scribus 1.5.3.
Attempting to install the F24 Scribus 1.4.6 caused dnf to offer to delete 274 applications, so I chose not to do that!
I am left with Scribus 1.4.6 with no spell checker on Fedora 25, plus Scribus 1.5.3 with a working spell-checker.
It would have saved a lot of work if the Fedora 25 compilation of Scribus 1.4.6 had included libhunspellplugin.so (what were they thinking?), but that is all water under the bridge."
Still othere say the problem is fixed/cured in Scribus 1.5.X versions. We are at 1.4.8. I doubt that's the case.
Editing in Libre just to import into Scribus is stupid. I've used Scribus as a functional word processor in the past and I like it. Wonder if there was just some hiccup between versions as far as rundeps or incompatibilities?
The likelihood of me being all wrong is a pretty good explanation as well.
Either way I donated 90 minutes to it, with no victory.
edit/adding all this:
In english this would be your normal preferences/spellcheck box:

Note the installed Hunspells on the left and to the right, under "Downloadable" they are already checked as 'installed.'
Redundancy? (I didn't do the online download or did I?).
OR should I rip out everything that is not ENG, like other forums have posited as a fix?
To replicate, open new scribus doc, insert a text box, type jibberish:

voila, no spellcheck squigglies.