Word or term for an argument that is inherently true

Solution 1:

I would say those are near-tautologies, and certainly truisms.

Solution 2:

Axiomatic is another fine choice here. It means self-evident and beyond requiring proof.

Link to dictionary definition.

Solution 3:

A circular argument is one where the conclusion is also one of the premises:

Good websites are the ones that are effectively designed.

In other words, in premise / conclusion form:

If a website is effectively designed, then it is good.

This is essentially defining good to be equivalent of effective, therefore the conclusion is the premise.

Well managed businesses rarely go out of business.

In premise / conclusion form, this is:

If a business is well managed, then it is likely to continue to operate.

Or, stating the implicit premise,

If a business continues top operate AND it operates in a well managed fashion, then it is likely to continue to operate.

Circular argument is also known as circular logic and circular reasoning.

Solution 4:

I would say that the argument is irrefutable. Indisputable has the same connotation.

And a word that I would actually use to describe your example phrases and not so much the question is cliché.

Solution 5:

Following Kant, it is also sometimes called an analytic proposition.