Which word best describes someone who lacks courage?

The term "craven" specifically refers to someone who shows a complete lack of courage or a cowardly demeanor. It encapsulates a sense of timidity and an unwillingness to face danger, pain, or difficulty. This word is often used to describe individuals who shy away from challenges or responsibilities out of fear, reflecting a deep-seated deficiency in bravery.

In contrast, the other options do not carry this meaning. "Garrulous" describes someone who is excessively talkative, particularly about trivial matters, which has nothing to do with courage. "Florid" refers to something overly intricate or ornate, such as language or decoration, and has no association with a person's moral or emotional fortitude. "Laud" means to praise someone or something, which is unrelated to the absence of courage. Hence, "craven" is the most suitable word in this context.