Pretty good – WordBook Dictionary Review
UPDATE: I've gotten used to most of the user interface quirks so I'll give it an extra star. Good for finding words that aren't in other American dictionaries. I think it looks odd that the original word is included in the Thesaurus entries, but I suppose it saves storage to be able to link one entry to multiple words.
Original review from 6 yrs ago:
I find this app to be handy but with some shortcomings. I find the user interface a bit awkward - I wish the navigation arrows went between screens I've looked at and not just screens within a category (more like a web browser). The depth & detail are inconsistent across definitions (i.e. for different words or phrases) but generally good when the info is there. Some of the written pronunciations are dead wrong; in those cases the audio version is usually correct (and vice versa). The app is worth having but could be better.
Review by Tremolux66 on
WordBook Dictionary.