Bittersweet
WordNet
adjective
(1) Tinged with sadness
"A movie with a bittersweet ending"
(2) Having a taste that is a mixture of bitterness and sweetness
noun
(3) Twining shrub of North America having yellow capsules enclosing scarlet seeds
(4) Poisonous perennial Old World vine having violet flowers and oval coral-red berries; widespread weed in North America