Do You Suffer from HYLUAB Syndrome? January 22, 2015 by Mary Gow Untitled, by Mary GowAlso known as the Hiding Your Light Under a Bushel Syndrome. It’s a habit pattern characterized by consistent denial that one is good at anything. At times it has mistakenly been labeled as shyness, introversion or being highly-sensitive. It could begin in childhood and continue for decades but is not incurable.