Which of the following words implies a sense of urgency or importance in its tone?

The word that implies a sense of urgency or importance in its tone is "vitriolic." This term is often used to describe speech or writing that is filled with bitter criticism or malice. Because it conveys strong emotions and intense opposition, the tone associated with vitriolic communication suggests that the subject at hand is of significant importance or urgency, particularly in contexts where heated debates or conflicts occur. The weight of vitriol in language indicates that the speaker is passionately engaged in the topic, often because they believe it deserves immediate attention or response.

The other choices do not carry the same sense of urgency. "Canard" refers to a false rumor or story, lacking inherent urgency. "Chide" indicates mild reproach or scolding, which does not have the same weight of importance. "Vernacular" pertains to the language or dialect spoken by a particular group, and while it can be relevant in context, it does not imply urgency or importance. Thus, among the options, "vitriolic" is the term that best encapsulates both urgency and importance through its connotation and usage.