The definition for negate is "To make invalid." Used in a sentence: Paula negated Tiffany's argument by proving that her main premise was false. The definition for eloquent is "fluent, expressive.", the definition for methodical is "Performed in an orderly manner.", and the definition for stern is "Harsh, severe."

The definition for augment is "To make greater." Used in a sentence: Wanda read the dictionary every night to augment her vocabulary. The definition for opportune is "suitable or convenient.", the definition for buffer is "Protective barrier.", and the definition for untenable is "Not able to be defended."

The definition for insolence is "Boldness or rudeness." Used in a sentence: The boy's insolence to the policeman embarrassed his mother. The definition for duplicity is "deceptive thought, speech, or action.", the definition for anthology is "A collection of selected literary pieces.", and the definition for discern is "To recognize as separate as distinct."

The definition for derelict is "Abandoned." Used in a sentence: The derelict house was condemned as a public hazard. The definition for demean is "to lower status.", the definition for deferment is "The act of delaying.", and the definition for buffer is "Protective barrier."

The definition for combustion is "Act of burning." Used in a sentence: Campers must use fire with great caution to prevent combustion of the parched brush. The definition for preclude is "to rule out in advance.", the definition for obnoxious is "Highly offensive.", and the definition for penurious is "Extrememly stingy."