I feel that Wikitionary is rather underappreciated. I would like to ues it as my main dictionary, but I haven’t been able to find a good app that uses it as a backend.
I’ve been using QuickDic since forever: https://f-droid.org/packages/de.reimardoeffinger.quickdic/
This might be what you’re looking for. When translating between languages other than English (German - Spanish in my case) the data can be a bit lacking but it generally works really well.
Aard 2 (Offline dictionary) https://f-droid.org/packages/itkach.aard2/
I don’t know if this helps, but if you use DuckDuckGo as a default search engine in your browser, its easy to look things up on Wiktionary using !wt. And yeah, Wiktionary is awesome and very underappreciated.
That’s a useful bang!