wild, mad, flurried
怳 centers on a disturbed, unsettled state of mind: wildness, madness, or being flurried and agitated.
怳 combines the heart radical 忄 with 兄, which likely contributes the sound. The exact historical development is uncertain, but the character is associated with disturbed mental states.
The heart radical 忄 beside 兄 (older brother) suggests an older brother whose heart is wild and flurried, acting mad.
For キョウ, imagine a wild, mad older brother in Kyoto (京都, きょうと): Kyoto -> キョウ, and his heart is flurried.