Simply enter a word, and Thessa will provide a curated list of synonyms, some common substitutes and some rare archaisms. The last synonym will be a Bulgarian cognate.
Click on any synonym to get a concise definition generated by AI. Click the synonym again while the definition is open to copy it to your clipboard.
To use Thessa, you'll need to provide your own Google Gemini API key. This key is stored securely in your browser's local storage. You can manage your API key via the settings icon (⚙️).
Expand your vocabulary and refine your expression with Thessa!