The definition for opportune is "Suitable or convenient." Used in a sentence: Quan stepped onto the platform at the most opportune time, just as the train pulled in. The definition for pallid is "lacking color.", the definition for negate is "To make invalid.", and the definition for perception is "Capacity for seeing or understanding."

The definition for untenable is "Not able to be defended." Used in a sentence: Rashid made the untenable statement that George Washington was the second president of the United States. The definition for repel is "to resist, reject.", the definition for corroborate is "To support with evidence.", and the definition for demeanor is "Behavior towards others."

The definition for prudent is "Marked by wisdom, shrewd." Used in a sentence: Manny was happy she followed Greg's prudent advice to study, as the test was difficult. The definition for perception is "capacity for seeing or understanding.", the definition for aerate is "To supply with air.", and the definition for solace is "Source of consolation."

The definition for buffoonery is "Foolish behavior." Used in a sentence: Clarence, an irrepressible comic, was held after cass for his buffoonery. The definition for brandish is "to shake or wave menacingly.", the definition for extol is "To praise highly.", and the definition for extenuating is "Partially excusing."

The definition for corroborate is "To support with evidence." Used in a sentence: "Unless you can corroborate your story, it will not be admissible in court," the attorney told his client. The definition for accentuate is "to emphasize.", the definition for serenity is "Calmness.", and the definition for heed is "To pay attention to."