What term describes a warm and friendly demeanor?

The term "cordially" refers to a warm and friendly demeanor. When someone is described as being cordial, it indicates that they are welcoming and pleasant in their interactions with others. This term is often associated with a sense of kindness and graciousness, making it ideal for describing someone who creates a friendly atmosphere.

In contrast, the other options do not convey the same sense of warmth or friendliness. While "vigorous" refers to being strong, healthy, or energetic, it lacks the connotation of social warmth. "Accumulate" means to gather or collect over time, and does not pertain to personality traits. "Inhibit" refers to restraining or holding back, which is the opposite of creating a welcoming demeanor. Thus, "cordially" stands out as the term that best encapsulates a warm and friendly tone.