1) Accessible 2) Apprehensible 3) Approachable 4) Clear 5) Comprehendible 6) Explicable 7) Fathomable 8) Graspable 9) Intelligible 10) Logical 11) Lucid 12) Perceivable 13) Plain 14) Reasonable 15) Understandable 1) Apprehensible 2) Approachable 3) Clear 4) Comprehendible 5) Explicable 6) Graspable 7) Intelligible 8) Knowable 9) Obvious 10) Provable 11) Understandable 
• (a.) Capable of being understood; intelligible; conceivable by the mind. • (a.) Capable of being comprehended, included, or comprised.
Com'pre·hen'si·ble adjective [ Latin comprehensibilis : confer French compreéhensible .] 1. Capable of being comprehended, included, or comprised. « Lest this part of knowledge should seem to any not comprehensible by axiom, we will set down some heads of it. B...
[adj] - capable of being understood or interpreted 2. [adj] - readily comprehended or understood
comprehendible adjective capable of being comprehended or understood; `an idea comprehensible to the average mind`
capable of being comprehended or understood; intelligible.