ruminative
/ˌruːmɪˈneɪ.tɪv/Definitions
1. adjective
containing or characterized by rumination; thoughtful and introspective, often in a melancholic or nostalgic way
“Her ruminative nature made her a great writer, able to capture the depth of human emotions in her stories.”
2. noun
a person who thinks or reflects deeply and often slowly about something, especially in a melancholic or nostalgic way
“He was known as a ruminative thinker, often lost in thought as he pondered the complexities of life.”