After looking on some websites for 11 letter adjectives starting with "M", selected the non-medical or technical or related-to-science words (btw, after that, very few words were left 😅) , check for the translation and the definition, I realized someone else already comment the word "magnanimous".
So... I'll see you next time 😅.
Nice to meet you Patjewell, I will keep my eye on your mini contests haha.