Partially sweet or sweetened, but having a distinct bitter component. Especially used to describe dark chocolate that is much less sugary than milk chocolate.

the state or quality of being semisweet.

(uncountable) Chocolate with a cocoa content greater than that of milk chocolate and lower than that of dark chocolate. / (uncountable, US law) See quotation.

plural of semisweet chocolate

In a somewhat sweet manner, but with an element of asperity.