Cutesy (adjective)

1. Intended to be charming or attractive in a childlike or quaint way.
2. Overly or affectedly cute.

Origin:

1930s: from cuteness + -y.

Examples:

1. The cutesy design on the packaging made it appealing to children.
2. The cutesy decor in the room was too saccharine for her taste.
3. The cutesy words and phrases used in the conversation were grating.
4. The cutesy characters in the cartoon were meant to be endearing.
5. The cutesy behavior of the actress was seen as insincere.