simple past tense and past participle of sweeten

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

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

comparative form of sweet: more sweet

The process of making something sweeter. / A sweetener.

present participle of sweeten

Third-person singular simple present indicative form of sweeten

(idiomatic) To increase a wager. / (idiomatic) To make something more desirable.

plural of sweetener

plural of artificial sweetener