In math, the word is used pretty much as a synonym for 'obvious'. But if you understand something well, it is obvious to you, which is why many results are call

In math, the word is used pretty much as a synonym for 'obvious'. But if you understand something well, it is obvious to you, which is why many results are called trivial by those who understand them. A math professor I had once took a very, very long time to think about a question. After that, his first response was 'that is trivial', after which a quite long explanation followed.