1) Adage 2) Axiom 3) Banality 4) Bromidic 5) Chestnut 6) Cliche 7) Fact 8) Maxim 9) Platitude 10) Saying 1) An obvious truth 2) Axiom 3) Cliché in the making 4) Dead men tell no tales 5) Obvious observation 6) Obvious statement 7) Platitude 8) Rain is wet 9) Self-evident cliche 10) Self-evident statement 11) Self-evident truth 12) Something obviously correct 13) Statement of obvious fact 14) Statement of the obvious 
A self-evident fact, p.e., a circle is round. A statement of the obvious, p.e., clowns are funny.
A truism is a claim that is so obvious or self-evident as to be hardly worth mentioning, except as a reminder or as a rhetorical or literary device, and is the opposite of falsism. In philosophy, a sentence which asserts incomplete truth conditions for a proposition may be regarded as a truism. An example of such a sentence would be `Under approp....
• (n.) An undoubted or self-evident truth; a statement which is pliantly true; a proposition needing no proof or argument; -- opposed to falsism.
[n] - an obvious truth
noun an obvious truth
[SAT terms] an obvious statement of fact