Which word describes something that is clear and readily understood?

The term that best describes something that is clear and readily understood is "limpid." This word is often used to refer to a clarity in both a literal and metaphorical sense. For example, one might describe water that is exceptionally clear as limpid, allowing one to see through it easily. Additionally, in terms of language or expression, when something is described as limpid, it indicates that the ideas communicated are easily grasped and transparent, devoid of ambiguity.

The other choices do not convey the same meaning. "Lachrymose" refers to someone who tends to cry often or is overly tearful; "inimical" describes something that is hostile or harmful; and "lambaste" means to criticize someone or something very harshly. None of these options relate to clarity or ease of understanding, making "limpid" the correct choice for that specific context.