The adjective "simple" might have many meanings.
Some dictionaries say "a simple person is stupid".
8 STUPID [not before noun] someone who is simple is not very intelligent
I’m afraid Luke’s a bit simple.
But, the internet also have another definition of "simple person" which is completely opposite the one mentioned above.
Simple people, or people who claim minimalism, simplicity, and easy-going lives, are relaxed, patient, and present in their everyday lives.
A simple person is someone who is uncomplicated. They're grateful for the little things in life. They don't try to impress, they're humble. They know what really matters and what doesn't, they're very creative and of higher intelligence than most people, others have trouble understanding them because of the different levels of intelligence. A Simple person is usually of the highest intellect, great character, experienced, and wise. A simple person has a heart of gold and loves nature, their friends and family. It's the simple things in life that they enjoy like quality time. A simple person knows their time is short, so they'll spend every breathing second to make the best of it. They're great listeners, give the best advice. Smart, charismatic, brave and blessed with natural beauty.
In everyday conversation,
Do people think his is stupid if they hear someone say "he is very simple" or it depends on contexts?
Now, "humility" is the noun of "humble" and we have this sentence
He is very humble and his humility set a good example for his children
Now, suppose I use the adjective "simple" with its positive meaning above "claim minimalism, simplicity, and easy-going lives, are relaxed, patient"
What is the noun of this adjective?
What should I fill in this blank?
He is very simple and his ____ (simplicity/simpleness/...) set a good example for his children