I am a non-native speaker who thought understood the meaning of 'less than trivial' to mean more complicated than trivial. My intuition came from assuming that given an adjective then 'less than' would mean going less in the direction of the meaning of the adjective, the opposite direction. For example, 'less than happy', or 'less than pleased' to mean not so happy or somewhat displeased. See these links, although I don't know if they are considered reliable.
Then I saw someone using 'more than trivial' to mean (deduced from the context) more complicated than trivial.
I tried searching in Google, but couldn't find which one is the meaning of each. A native speaker told me that to them 'less than trivial' sounded odd, but 'more than trivial' sounded more common (to them), and carrying the meaning above.
I just wanted to confirm these claims, or if not find the right meaning.
If they are not correct, is it true the generalization that I was making? Namely, that 'less than <adjective>' has a meaning that goes somewhat in the direction of the antonym of the <adjective>?
Not sure if degree-of-comparison is a tag that applies here. It didn't have a description.
Examples that I have found so far:
Here 'more than trivial' is being used to mean more complicated than trivial (material). This is an example contradicting my guess. By the way, maybe there is also a difference between 'more-than-trivial' and 'more than trivial', together with context.
This one seems to be using 'less than trivial' to mean more complicated than trivial. This is agreeing with my guess.