The spelling of the word "unvisible" is incorrect. The correct spelling is "invisible," which means not visible or able to be seen. The pronunciation of "invisible" is /ɪnˈvɪzəbl/, with the stress on the second syllable. The word is derived from the Latin word "invisibilis," which means not visible or imperceptible. It is important to use correct spelling in written communication to ensure clear and effective communication.