Both bitter and sweet. / Expressing contrasting emotions of pain and pleasure. / Of bittersweet color.

Solanum dulcamara. / Bittersweetness. / (US) A vine, of the genus Celastrus, having small orange fruit that open to reveal red seeds. / A variety of apple with a bittersweet taste.

In a bittersweet manner.

The state or condition of being bittersweet.

Marked by bitterness (literal and figuratively)