Some examples of uncommon words in the dictionary are:1. Defenestrate - to throw someone out of a window2. Epiphany - a sudden realization or comprehension3. Equanimity - mental calmness and composure, especially in difficult situations4. Mellifluous - having a smooth, sweet, and pleasant sound5. Obfuscate - to make something unclear, confusing, or difficult to understand6. Serendipity - the occurrence of fortunate and unexpected events7. Vernacular - the language or dialect spoken by the ordinary people in a particular country or region8. Quixotic - excessively idealistic; unrealistic and impractical9. Zeitgeist - the defining spirit or mood of a particular period of history10. Onomatopoeia - the use of words that imitate the sounds they represent