A free program for Android, by VD.

Offline Pocket English Dictionary is a free offline dictionary & thesaurus app with synonyms and antonyms packed in a very small size. It’s a perfect app for writers, poets, and anyone else looking to use different words in their writings. The dictionary is also perfect for anyone looking to improve their vocabulary, whether it be for business purposes or simply for fun. This app can be used in ways such as:

Search – This is the main function of the dictionary, it will search for the synonyms and antonyms of the word you enter. The results are sorted by frequency, so the most common words will appear at the top.

Vocabulary – This function shows the vocabulary of the thesaurus, synonyms, and antonyms.