bittersweet

nouns

poisonous perennial Old World vine having violet flowers and oval coral-red berries; widespread weed in North America
Solanum dulcamara, bittersweet, bittersweet nightshade, climbing nightshade, deadly nightshade, poisonous nightshade, woody nightshade
twining shrub of North America having yellow capsules enclosing scarlet seeds
American bittersweet, Celastrus scandens, bittersweet, climbing bittersweet, false bittersweet, shrubby bittersweet, staff vine, waxwork

adjectives

tinged with sadness
"a movie with a bittersweet ending"
bittersweet
is similar to
experiencing or showing sorrow or unhappiness
"feeling sad because his dog had died"; "Better by far that you should forget and smile / Than that you should remember and be sad"- Christina Rossetti
sad
having a taste that is a mixture of bitterness and sweetness
bittersweet, semisweet