Limpid /(lĭm"pĭd)/

Lim·pid

Limpid

a.
  1. Characterized by clearness or transparency; clear; as, a limpid stream.
    Springs which were clear, fresh, and limpid.
  2. Clear and unambiguous; lucid; easy to understand; -- of speech and writing; as, limpid prose.
  3. Calm, untroubled, and without worry; serene.