Definition.

" It's funny - when people call you 'shy', they usually smile. Like it's cute, some funny little habit you'll grow out of when you're older, like the gaps in your grin when your baby teeth fall out. If they knew how it felt - really being shy, not just unsure at first - they wouldn't smile. Not if they knew how the feeling knots up your stomach or makes your palms sweat or robs you of the ability to say anything that makes sense.

It's not cute at all."

Quoted.