Lucid
Part of speech: adjective
Definition: clear; easily understood mentally rational; sane bright, luminous, translucent or transparent
Example sentence: Long before the idea of a writer's conference was a glimmer in anyone's eye, writers learned by reading the work of their predecessors. They studied meter with Ovid, plot construction with Homer, comedy with Aristophanes; they honed their prose style by absorbing the lucid sentences of Montaigne and Samuel Johnson.
Rational
Part of speech: adjective
Definition: Reasonable; not absurd, foolish, emotional, or fanciful.Capable of reasoning.Of a number, capable of being expressed as the ratio of two integers.Of an algebraic expression, capable of being expressed as the ratio of two polynomials.
Part of speech: noun
Definition: A rational number: a number that can be expressed as the quotient of two integers.
Example sentence: The lesson of my field, behavioral economics, is that we need to understand the ways in which we differ from the rational human assumed in standard economic theory.