trivial

Short definition from Wiktionary

Adjective

1. 1
   Ignorable; of little significance or value.
2. 2
   Commonplace, ordinary.
3. 3
   Concerned with or involving trivia.
4. 4
   Relating to or designating the name of a species; specific as opposed to generic.
5. 5
   Of, relating to, or being the simplest possible case.
6. 6
   Of, relating to, or being the simplest possible case: Containing only one element; having an underlying set which is a singleton.
7. 7
   Self-evident.
8. 8
   Pertaining to the trivium.
9. 9
   Indistinguishable in case of truth or falsity.

Noun

1. 1
   Any of the three liberal arts forming the trivium.