Was adventure time supposed to be an adult tv show?

No, Adventure Time is not an adult TV show. It is an American animated television series created by Pendleton Ward for Cartoon Network. The series follows the adventures of Finn the Human and his best friend Jake the Dog, who live in the post-apocalyptic Land of Ooo. Adventure Time is rated TV-PG, which means it may be unsuitable for children under the age of 10 without the presence of an adult guardian.