Presumed without analysis.
Self-evident, intuitively obvious.
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.
Something uncertain.
Not certain; unsure.
Not yet determined; undecided.
Variable and subject to change.
Fitful or unsteady.
Unpredictable or capricious.
Not known for certain; questionable.