This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
憥 combines 勞 (labor, toil) with 心 (heart), suggesting a heart burdened by toil. The exact historical development is uncertain.
The top 勞 suggests labor and effort, while the bottom 心 is the heart. Picture a heart weighed down by hard work, struggling under the strain.
For ロウ, imagine a low, heavy heart sinking under labor: low -> ロウ, and the heart 心 at the bottom feels the weight of 勞 above.