trivial
trivial: adj. 1. Too simple to bother detailing. 2. Not worth
the speaker's time. 3. Complex, but solvable by methods so well
known that anyone not utterly cretinous would have thought of them
already. 4. Any problem one has already solved (some claim that
hackish `trivial' usually evaluates to `I've seen it before').
Hackers' notions of triviality may be quite at variance with those
of non-hackers. See nontrivial, uninteresting.
The physicist Richard Feynman, who had the hacker nature to an
amazing degree (see his essay "Los Alamos From Below" in "Surely
You're Joking, Mr. Feynman!"), defined `trivial theorem' as "one
that has already been proved".