Self-evident (adjective)

1. Readily apparent or obvious to the mind without need of proof or evidence.
2. Not requiring proof or demonstration; being evident without proof.

Origin:

From late 16th century, from latin "self-evidentem", present participle of "self-evidere", meaning "to be evident in oneself".

Examples:

1. The truth of this statement is self-evident.
2. Self-evident truths are those that are so plain and simple that they require no explanation.
3. The benefits of exercise are self-evident.
4. His innocence was self-evident to everyone in the room.
5. The self-evident superiority of this brand is what makes it so popular among consumers.