not made sweet

or no added sugar, no added sweet flavor; probably sugarless, plain or bitter in taste, but not always. Unsweetened tea is not to everyone’s taste but unsweetened fruit juices are perfect, as there is no need to add any sweetener to something it is already sweet. Opposites are sweet, saccharine, or syrupy. Food with a vinegary flavor would taste like vinegar. It would be acetous, sour, acid, acidic, tart, astringent, pungent, harsh, acrid; never sweet.