Clear, evident, certain.

Manifest to the understanding, plain, evident.

Manifest to the mind or judgement, evident, plain.

Unmistakable; sheer, pure, absolute, utter, downright. Chiefly attributive as an intensifier.

Manifest to the understanding; evident, plain, clear, obvious; palpable.

Capable of being shown or made evident; (also) evident; readily apparent.

Demonstrated, proved, shown. As an adjective.

Easy to perceive, evident, obvious. Obsolete.

Of knowledge, an idea, etc.: developed in detail; (hence) clear, definite, plain.

Of apodictic nature; absolutely demonstrable; of absolute certainty.

Shown to be true, or to be as stated or claimed; proven, verified; (also) evident, manifest.

Of clear demonstration; established on incontrovertible evidence. (By Kant applied to a proposition enouncing a necessary and hence absolute truth.)

In the conclusive expression, that's flat (a) formerly = that's the absolute, undeniable truth; (b) a defiant expression of one's final resolve…

Distinct, definite; pronounced, noticeable. Also: outright, complete.

Clearly perceptible or discernible by the senses or the mind; clear, plain, definite. In modern use: That is clearly such; unmistakable, decided…