We're developing an application where we have categories users may progress towards, and one of them is 'to look on the bright side; to live without worry, etc.'. However, categories are titled with a single word, and I have failed to think of a word that perfectly suits that meaning.
Can anyone assist?
An optimist is a person who looks on the bright side. Optimism is the word for the perspective itself.
Sanguinity is another option.
Added: Based on your criteria, I would go with either carefreeness or lightheartedness. I personally prefer the second and think it's used more often. Both words are commonly known, if that's what you mean by "popular."
How about positivism or brightness or carefree?
Cheerful, "noticeably happy and optimistic; bright and pleasant" may suit.
Also consider blithe. In one sense it means "happy, cheerful" (although Wiktionary claims this usage is dated or literary), and in another sense, "indifferent, careless, showing a lack of concern". Synonyms of it include animated, buoyant, cheerful, gay, happy, jovial, lighthearted, lively, merry, sprightly.
While these are mostly adjectives rather than nouns, as category headings that might not matter.
The common British name Felicity means "happiness" and would make a great category name.
