Reverse Dictionary: CLEAR (easy to understand)

ADJECTIVES
1200 — BRIGHT clear, evident; easy to perceive or understand 
1382 — PREST clear to the understanding; manifest → obs.
1536 — DECLARATIVE making clear, manifest, or evident → obs.
1601 — UNCURIOUS clear, intelligible → obs.
1651 — DILUCIDATE made clear, plain, or lucid → obs.
1836 — REDD clear, distinct, fluent → Sc.
1999 — CLEAR AS A BELL perfectly clear, esp. in sound quality (Bk.)
1999 — CLEAR AS CRYSTAL perfectly clear or plain (Bk.)
1999 — STICKS OUT LIKE A DOG’S BALLS very clear, self-evident → Aust. sl. (Bk.)

NOUNS
1603 — DILUCIDITY clearness; lucidness; plainness → obs.

VERBS
1538 — DILUCIDATE to make clear, plain, or evident; to free from obscurity; to elucidate, to explain → obs.
1545 — ILLUCIDATE to make clear, to elucidate; to shed light upon 
1596 — ELIQUIDATE to make clear, to explain → obs.
1623 — COMMONSTRATE to make clear; to teach, to demonstrate, to impart information → obs.
1930 — LAY IT OUT to make something clear; to inform, to pass on information → sl.