Unimportant details are often small and insignificant facts that are not necessary to remember or consider. NITS, TRIVIA, and MINUTIA are all terms used to describe unimportant details. NITS is an acronym for 'Not In The Scheme', which refers to details that are not part of the main plan. TRIVIA is a term used to describe facts that are not important or relevant. Finally, MINUTIA is a term used to describe small, insignificant details. All three terms can be used to refer to unimportant details.