English to English
1. Sweet and then bitter or bitter and then sweet; esp. sweet with a bitter after taste; hence (Fig.), pleasant but painful.
2. tinged with sadness
a movie with a bittersweet ending
3. having a taste that is a mixture of bitterness and sweetness
4. poisonous perennial Old World vine having violet flowers and oval coral-red berries; widespread weed in North America
5. twining shrub of North America having yellow capsules enclosing scarlet seeds
6. Anything which is bittersweet.