There are plenty of dictionary apps out there, but Ultralingua is for serious wordsmiths. It contains several dozen complete dictionaries with definitions, conjugations, slang, and even translation into multiple languages.

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When you install the app, you get a full dictionary and thesaurus in English. This is quite a bit more detailed than the dictionaries you'll find in other apps and web resources with tons of usage notes and examples. The other 35+ dictionaries (including the ones for translation) are available via in-app purchases. Each one is a few dollars, so you can just get the ones you want.

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There's nothing special about the design—no flashy animations or widgets. It's just words, words, words, but maybe that's what you need.