well-defined

black-and-white, explicit, trenchant

apparent, bald, bald-faced, barefaced, bright-line, broad, clear, clear-cut, crystal clear, decided, distinct, evident, lucid, luculent, luminous, manifest, nonambiguous, obvious, open-and-shut, palpable, patent, pellucid, perspicuous, plain, ringing, straightforward, transparent, unambiguous, unambivalent, unequivocal, unmistakable

cognizable, cognoscible, comprehendible, comprehensible, digestible, fathomable, graspable, intelligible, knowable, understandable

self-evident, self-explanatory

clean-cut, simple, tidy, uncomplicated

overt, undisguised

appreciable, perceptible, recognizable, sensible, tangible

discernible (also discernable), noticeable, observable, visible

clean, decipherable, fair, legible, readable