Final answer:
The least honest communication style is one that employs uncertainty and ambiguity in language choices to soften the message.
Step-by-step explanation:
The communication style in which the speaker is least honest is the one that employs a lot of uncertainty and ambiguity. This style is characterized by the use of words and phrases such as "it seems that," "I may be wrong, but," and "possible." These language choices are used to soften the message and create an impression of uncertainty, even if the speaker may actually have more certainty about the topic.