The definition for incumbent is "Necessary as a duty or responsibility." Used in a sentence: It was incumbent on Jack to attend his father's retirement party. The definition for fickle is "lacking constancy, changeable.", the definition for retroactive is "effective as of a prior time or condition.", and the definition for epistolary is "Contained or carried on in letters."

The definition for disdain is "Feeling of contempt." Used in a sentence: The arrogant writer did not hide his disdain for his uneducated dinner companion. The definition for frugal is "thrifty, cheap.", the definition for polarize is "To break up into opposing groups.", and the definition for rail is "To scold in harsh language."

The definition for incongruous is "Not harmonious, incompatible." Used in a sentence: Sadie's cowboy hat was incongruous with her black cocktail dress. The definition for extant is "currently existing.", the definition for penurious is "Extrememly stingy.", and the definition for comparable is "Similar, equivalent."

The definition for rail is "To scold in harsh language." Used in a sentence: Clay began to cry as his irate manager railed at him for missing the deadline. The definition for onset is "beginning.", the definition for rancorous is "Marked by deep ill–will.", and the definition for implement is "To carry out or accomplish."

The definition for obnoxious is "Highly offensive." Used in a sentence: The manager asked the obnoxious diner to leave the restaurant. The definition for pomp is "showy display.", the definition for rail is "To scold in harsh language.", and the definition for prominence is "Importance."