Clear, manifest, evident.

Exposed to the mind, brought to light; evident, plain, clear, easy to understand. Now chiefly in to lay open: to reveal, explain, expose.

Of which the meaning is evident; simple, easily intelligible, readily understood. Now somewhat rare except in plain English, n., plain language n.…

Unmistakable, certain; true, genuine. Obsolete.

Of a word, language, style, etc.: homely, plain; easily understood. Obsolete.

Of instructions, a device, etc.: easy to understand or to make use of; simple.

Clear, lucid, manifest; easily understood. Obsolete.

Clearly determined (in various senses); esp. readily distinguished or identified; distinct.

Transparent; clear.

= incurious, adj. 6. Obsolete.

Of hearing, thought, intelligence, etc.: distinct, clear; indicating clear understanding.

Clearly perceptible or discernible by the senses or the mind; clear, plain, definite. to the mind or thought.

That cannot be misinterpreted; unambiguous.

Clear to the understanding; lucid, plain, manifest.

of immaterial things and figurative.

Made clear or lucid; = dilucid, adj.

Not mysterious; plain, straightforward, free from obscurity.

Not elaborate, or abstruse; simple. Obsolete.

Clear, plain, intelligible.

Able to be (readily) understood or appreciated.

Clearly perceived or perceptible; clear, distinct; marked, pronounced. Obsolete.

That cannot be mistaken for something or someone else; clearly recognizable; obvious; utterly distinctive or characteristic.

Clear, definitive, and unambiguous; not admitting of compromise or doubt. Also: characterized by directly opposing, simplistic notions of good and…

With reference to something immaterial (as a concept, statement, phenomenon, etc.): sharply defined or delineated; easy to perceive or grasp; free…

square on: (a) Cricket of a bowler: having one's body square to the batter; (b) figurative directly, honestly. Also as adj. phr., straightforward.