Farouche is an adjective that means sullen or shy in company. 

The Latin word foras (FOUR as) means ‘outdoors.’ As this word evolved into our word of the day, it came to refer to someone used to living outdoors. This soon referred to someone who was uneasy around others because of their outdoor lifestyle. These days, its meaning is a little simpler. It is a synonym of words like ‘shy’ and ‘introverted.’ Here’s an example:

I used to be farouche as a child, but I outgrew some of my introverted ways as I got older and more comfortable around others.