Which word describes a cheerful and lighthearted demeanor?

The word "blithe" is used to describe a cheerful and lighthearted demeanor, characterized by a carefree attitude that often conveys happiness and an absence of worry. This term suggests a sense of joyfulness and a positive outlook on life, making it a fitting choice for describing someone who radiates cheerfulness. In literature and conversation, "blithe" is often associated with a certain playful and upbeat nature, further emphasizing its appropriateness when referring to a joyful demeanor.

In contrast, the other options present oppositional sentiments: "morose," "sullen," and "dreary" all convey negative emotions or states of being. "Morose" describes a state of gloominess or sadness, "sullen" indicates a sulky or brooding mood, and "dreary" implies a lack of vitality or cheer, all of which are distinct from the lighthearted quality that "blithe" encapsulates. Thus, "blithe" stands out as the word that best captures a cheerful and lighthearted disposition.