Mulling over is a phrase used to describe a process of deep and careful consideration of a particular subject or idea. Synonyms for mulling over include pondering, reflecting, contemplating, scrutinizing, examining, meditating, and deliberating. Pondering involves giving careful thought to a subject or idea, while reflecting refers to thinking deeply about something in order to gain insight or understanding. Contemplation is a synonym that suggests a more focused, prolonged consideration, while scrutiny implies a detailed examination of a specific subject. To meditate is to use mental focus or relaxation techniques to attain a state of tranquility. Deliberating refers to carefully weighing options before making a decision.