Self-evident, intuitively obvious.
Presumed without analysis.
Based on hypothesis and theory rather than experiment or empirical evidence.
Developed entirely from scratch, without deriving it from existing languages.
In a way based on theoretical deduction rather than empirical observation.
Incontrovertible; demonstrably true or certain.
Absolute and without explanation, as in a command from God like "Thou shalt not kill!"
Being a style of argument in which a person presents their reasoning as categorically true, even if it is not necessarily so.