Light yellow tends to disappear into white, so it usually needs a dark color to highlight it. Shades of yellow are visually unappealing because they loose cheerfulness and become dingy. Dull (dingy) yellow represents caution, decay, sickness, and jealousy. Light yellow is associated with intellect, freshness, and joy.
The definition of a frown is a facial expression indicating displeasure by drawing the brows together and turning the lips downward. An example of frown is the face you make when you are unhappy about something.
The frown, the harsh rebuke, the frequent application of the rod, enjoined by Scriptural authority, were used, not merely in the way of punishment for actual offences, but as a wholesome regimen for the growth and promotion of all childish virtues. The Scarlet Letter by Hawthorne, Nathaniel View in context.