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 combustion is "act of burning.", the definition for commemorate is "To mark by a ceremony.", and the definition for preclude is "To rule out in advance."

The definition for turmoil is "Extreme confusion, agitation." Used in a sentence: The windstorm caused such turmoil in the lake that the sailboat capsized. The definition for pretentious is "making unjustified claims.", the definition for corroborate is "To support with evidence.", and the definition for ethical is "Conforming to accepted standards."

The definition for fickle is "Lacking constancy, changeable." Used in a sentence: The fickle Senji had a new best friend every month. The definition for serenity is "calmness.", the definition for flaunt is "To display showily.", and the definition for celebrated is "Widely known, respected."

The definition for trove is "Valuable collection." Used in a sentence: Walter's trove of vintage baseball cards was worth thousands of dollars. The definition for liability is "a person or thing whose presence or behavior is likely to cause embarrassment or put one at a disadvantage.", the definition for deferment is "The act of delaying.", and the definition for demean is "To lower status."

The definition for penurious is "Extrememly stingy." Used in a sentence: Ebenezer Scrooge was most penurious, refusing to give even a penny to charity. The definition for recrimination is "a retaliatory accusation.", the definition for awe is "Emotion combining dread and wonder.", and the definition for heinous is "Shockingly evil."