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 supple is "flexible.", the definition for refurbish is "To brighten or freshen.", and the definition for turpitude is "Essential baseness, depravity."

The definition for oblivious is "Lacking awareness." Used in a sentence: Love–struck Charlie was oblivious to everyone but the object of his affection. The definition for fickle is "lacking constancy, changeable.", the definition for augment is "To make greater.", and the definition for proximity is "Closeness."

The definition for commemorate is "To mark by a ceremony." Used in a sentence: Each year, the Franklins commemorate their anniversary by visiting the site of their first date. The definition for induce is "to influence or cause.", the definition for mandate is "An official order or commission to do something.", and the definition for refurbish is "To brighten or freshen."

The definition for retroactive is "effective as of a prior time or condition." Used in a sentence: The retroactive law made even past infractions punishable. The definition for rancorous is "marked by deep ill–will.", the definition for combustion is "Act of burning.", and the definition for illuminate is "To make clear."

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 redouble is "to make twice as great.", the definition for egotist is "Self–important person.", and the definition for rhapsody is "State of great happiness."