Write an 11-letter English adjective of Latin origin that be...

Prompt

Write an 11-letter English adjective of Latin origin that begins and ends with the same letter. Furthermore, all of its vowels must appear in strict alphabetical order (A-E-I-O-U) from left to right. Do not include any punctuation, hyphens, or spaces in the word. Break down your reasoning by counting the letters and listing the vowel positions to prove your answer satisfies every single constraint.