(transitive) To make sweet to the taste. / (transitive) To make (more) pleasant or to the mind or feelings. / (transitive) To make mild or kind; to soften.

superlative form of sweet: most sweet

(Southern US, Midland US) Sugar.

simple past tense and past participle of sweeten

made to taste sweet / containing sweetener / (figuratively) made more appealing or more attractive with incentives

(chiefly endearing) A sweetheart; a beloved person.

(Southern US, Midland US) A viscous, syrupy sweetener, generally molasses, but sometimes table syrup.

(often as a term of address) A person who is much loved. / A sweetheart. / A fruit that is a crossbreed between a grapefruit and a pomelo, originating in Israel. / (childish, UK) A sweet; a candy.

Forbidden things seem more appealing; people want things more if (or, in some way, because) they can't have them.

plural of sweetbread