* Unforgettable (5 syllables)
* Unbelievable (5 syllables)
* Disagreeable (5 syllables)
* Exaggerated (5 syllables)
* Philosophical (5 syllables)
Technical/Less Common
* Electromagnetic (5 syllables)
* Antiquarian (5 syllables)
* International (5 syllables)
Let me know if you're looking for a specific type of adjective (e.g., positive, negative, describing a particular object), and I can help you find some more!