Although we know that medieval writers were not novelists, we can still succumb to the illusion that the characters in their works occasionally exhibit a degree of psychological complexity and “depth” out of keeping with our historical expectations. Chaucer's Criseyde and Malory's Guinevere are such characters; in both, the illusion results largely from a technique of using dialogue to suggest responses, thoughts, or feelings that are otherwise hidden. To achieve such suggestiveness, Chaucer and Malory employ a device that theorists of speech acts call “implicature.” As we overhear the words of Criseyde and Guinevere, we must constantly fill in gaps, supply missing relations, and guess at some “real” meaning that the surface meaning seems to conceal. Through this process we participate in the construction of two characters whose elusiveness, opacity, and apparent inconsistency are surprisingly verisimilar.