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 placebo is "an inactive substance used in medical testing.", the definition for catastrophic is "Relating to extreme misfortune.", and the definition for penurious is "Extrememly stingy."

The definition for derelict is "Abandoned." Used in a sentence: The derelict house was condemned as a public hazard. The definition for avian is "relating to birds.", the definition for foil is "One that enhances or underscores by contrast.", and the definition for fraud is "Trick."

The definition for stifle is "To repress or discourage." Used in a sentence: Amy tried ineffectively to stifle her giggles after she read Susan's note in class. The definition for ethical is "conforming to accepted standards.", the definition for adversary is "One who opposes or resists.", and the definition for promote is "To contribute to the growth or prosperity of."

The definition for epitaph is "Brief statement honoring a dead person." Used in a sentence: "Beloved by all,"" was the epitaph Edgar chose for his wife's tombstone. The definition for induce is "to influence or cause.", the definition for inviolable is "Secure from assault of trespass.", and the definition for pomp is "Showy display."

The definition for methodical is "Performed in an orderly manner." Used in a sentence: Oscar's methodical approach exasperated his free–spirited friend Ben. The definition for obnoxious is "highly offensive.", the definition for comprehensible is "Understandable.", and the definition for extenuating is "Partially excusing."