adjective
saccharine
SAK-uh-rin/ˈsækərɪn/
Excessively sentimental.
The greeting card sits amid a saccharine display of hearts and roses.

Etymology
Sugar-like sweetness became a label for sweetness carried too far, including sentiment.
More examples
- The card's saccharine message embarrasses him.
- She dislikes the song's saccharine sentiment.
Forms
saccharine
Similar words
- sentimental
- Emotional, without always implying excess.
- cloying
- So sweet or sentimental that it becomes unpleasant.