languid
慵 centers on a state of physical or mental sluggishness: feeling languid, listless, or disinclined to exert effort.
慵 combines the heart radical 忄 with 庸, which likely contributes the sound and may suggest a sense of ordinariness or laxity, together expressing a languid state of mind.
The heart radical 忄 beside 庸 suggests a heart that is too ordinary or lax to be energetic: a languid, listless feeling.
For ヨウ, imagine a languid person yawning (ヨウ) with a heavy heart, too tired to move.