The definition for derivative is "Lacking originality." Used in a sentence: Critics panned the movie as a derivative version of last year's Best Picture. The definition for retroactive is "effective as of a prior time or condition.", the definition for incisive is "Impressively direct and decisive.", and the definition for gravity is "Importance, significance."

The definition for refurbish is "To brighten or freshen." Used in a sentence: Leeanne cleaned and mended all weekend to refurbish the shabby apartment. The definition for unscrupulous is "lacking principles.", the definition for compulsion is "An irresistible impulse.", and the definition for extol is "To praise highly."

The definition for mediate is "To come between parties in order to reconcile." Used in a sentence: The diplomatic Henry was able to mediate between the quarreling sisters. The definition for negate is "to make invalid.", the definition for defiant is "Showing bold resistance.", and the definition for civility is "Politeness."

The definition for heinous is "Shockingly evil." Used in a sentence: Eduardo's heinous betrayal of Lydia shocked even Latasha, who knew his evil ways. The definition for incumbent is "necessary as a duty or responsibility.", the definition for hedonism is "Belief that pleasure is the sole aim of life.", and the definition for eloquent is "Fluent, expressive."

The definition for buffer is "Protective barrier." Used in a sentence: The dense trees acted as a buffer against the heavy rain. The definition for facade is "false or superficial appearance.", the definition for advantageous is "Giving an advantage.", and the definition for melodious is "Having a pleasing melody."