What are some characteristics of an under mixed muffin?

An under mixed muffin typically has a dense and heavy texture, rather than being light and fluffy. The batter may contain visible streaks of flour or other dry ingredients, indicating insufficient mixing. Additionally, an under mixed muffin may have unevenly distributed ingredients, leading to pockets of sweetness or flavor in some areas while being bland in others. This inconsistency can affect both the taste and overall eating experience.