Bittersweet

a.	1.	Sweet and then bitter or bitter and then sweet; esp. sweet with a bitter after taste; hence (Fig.), pleasant but painful.
n.	1.	Anything which is bittersweet.
	2.	A kind of apple so called.
	3.	(Bot.) A climbing shrub, with oval coral-red berries (Solanum dulcamara); woody nightshade. The whole plant is poisonous, and has a taste at first sweetish and then bitter. The branches are the officinal dulcamara.

Noun	1.	bittersweet - poisonous perennial Old World vine having violet flowers and oval coral-red berries; widespread weed in North America Synonyms: bittersweet nightshade, climbing nightshade, poisonous nightshade, Solanum dulcamara, woody nightshade, deadly nightshade
	2.	bittersweet - twining shrub of North America having three-valved yellow capsules enclosing scarlet seeds Synonyms: American bittersweet, Celastrus scandens, climbing bittersweet, false bittersweet, staff vine, waxwork
Adj.	1.	bittersweet - tinged with sadness; "a movie with a bittersweet ending"
	2.	bittersweet - having a taste that is a mixture of bitterness and sweetness Synonyms: semisweet

semisweet, tasteful