Which word best describes someone who is shy?

The term that best describes someone who is shy is "reticent." This word specifically refers to a person who is reserved and reluctant to share their thoughts or feelings, often leading to a tendency to avoid speaking in social situations. Reticence conveys a sense of quietness and introspection, which aligns closely with the characteristics of shyness.

In contrast, resilient denotes the capacity to recover quickly from difficulties, which does not relate to shyness. Verbose describes someone who uses an excessive amount of words, which is the opposite of the reticent nature of a shy person. Affable means being friendly and easy to talk to, which also stands in contrast to the reserved disposition typical of someone who is shy. Thus, reticent is the most accurate descriptor for shyness among the given choices.