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Synonyms for Bittersweet (same or very similar meaning)

WordNet sense 1 (poisonous perennial Old World vine having violet flowers and oval coral-red berries; widespread weed in North America):
bittersweet nightshade, climbing nightshade, poisonous nightshade, Solanum dulcamara, woody nightshade, deadly nightshade

WordNet sense 2 (twining shrub of North America having yellow capsules enclosing scarlet seeds):
waxwork, American bittersweet, Celastrus scandens, climbing bittersweet, false bittersweet, shrubby bittersweet, staff vine

WordNet sense 3 (having a taste that is a mixture of bitterness and sweetness):

WordNet sense 4 (pleasing to the sense of taste):

WordNet sense 5 (experiencing or showing sorrow or unhappiness):

From the ODE community, based on WordNetadd/edit