ignorant and foolish, run around aimlessly, unable to fulfill one's will
憁 centers on a state of mental confusion and aimlessness: being ignorant and foolish, running around without purpose, or being unable to carry out one's intentions.
憁 combines 忄 (heart/mind) with 悤, which likely contributes both sound and the idea of haste or confusion. The exact historical development is uncertain.
The heart radical 忄 beside 悤 suggests a mind in a hurried, scattered state. Picture your thoughts running around aimlessly like a confused person unable to settle on a goal.
For ソウ, imagine a soul (ソウ) lost in confusion, wandering aimlessly: soul -> ソウ, and the lost soul embodies the kanji's meaning of foolish wandering.
—