1) Clear 2) Crystal clear 3) Easily understandable 4) Limpid 5) Lucid 6) Luculent 7) Pellucid 8) Transparently clear 1) Clear 2) Lucid 3) Luculent 
easily understood; clearly expressed
• (a.) Capable of being through; transparent; translucent; not opaque. • (a.) Clear to the understanding; capable of being clearly understood; clear in thought or in expression; not obscure or ambiguous; as, a perspicuous writer; perspicuous statements.
Per·spic'u·ous adjective [ Latin perspicuus , from perspicere to look through. See Perspective .] 1. Capable of being through; transparent; translucent; not opaque. [ Obsolete] Peacham. 2. Clear to the understanding; capable of being clearly understood; c...
[Obscure words] transparently clear; easily understandable[Intelligent words] transparently clear; easily understandable