carefree
adj.having no worries or responsibilities. You use this to describe someone who feels happy and light because they do not have any problems to think about.
adj.free from anxiety or responsibility; having a lighthearted and untroubled disposition. Often used to describe a period of life or a specific personality trait.
“She spent a carefree summer traveling across the country.”
“After finishing his final exams, he enjoyed a few carefree weeks before starting his new job.”
“The novel captures the carefree atmosphere of the coastal town, where the residents seem entirely insulated from the political turmoil affecting the rest of the nation.”
Typically used as an attributive adjective before a noun or predicatively after a linking verb like 'feel' or 'seem'.'
“There is a carefree atmosphere as some sip prosecco from a pop-up bar cart.”
From care + -free.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.