“Our authorities, all agree in ascribing to the youth of Mohammad a modesty of deportment and purity of manners rare among the people of Makkah… The fair character and honorable bearing of the unobtrusive youth won the approbation of his fellow citizens; and he received the title, by common consent, of Al-Ameen, the Trustworthy.”

The well known British historian, Sir William Muir [1819-1905], in his “Life of Mohammed”
https://www.islamicity.org/3490/what-do-they-say-about-prophet-muhammad/