anxiety
悄 centers on a quiet, inward distress: a state of anxiety or worry that is felt deeply but not necessarily expressed outwardly.
悄 combines the heart radical 忄 with 肖, which likely contributes the sound. The heart radical points to an emotional state, and the compound suggests a quiet, anxious feeling.
The heart radical 忄 beside 肖 (which can suggest a small, quiet sound) paints a picture of a heart that is quietly troubled—anxiety simmering inside.
For ショウ, imagine a person showing their anxiety through a quiet, trembling voice: show -> ショウ, and the heart 忄 is full of worry.