The definition for rancorous is "Marked by deep ill–will." Used in a sentence: The rancorous competition between the two chess clubs actually ended in a brawl. The definition for pathos is "sympathetic pity.", the definition for catastrophic is "Relating to extreme misfortune.", and the definition for discern is "To recognize as separate as distinct."

The definition for placebo is "An inactive substance used in medical testing." Used in a sentence: Tom, who had taken the placebo, found that his allergy symptoms did not go away. The definition for derivative is "lacking originality.", the definition for unscrupulous is "Lacking principles.", and the definition for disdain is "Feeling of contempt."

The definition for incisive is "Impressively direct and decisive." Used in a sentence: Samir's incisive leadership made him the natural choice for president of the company. The definition for inauspicious is "not favorable.", the definition for benevolent is "Kind, helpful.", and the definition for incumbent is "Necessary as a duty or responsibility."

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 euphoria is "feeling of great happiness.", the definition for commemorate is "To mark by a ceremony.", and the definition for gruff is "Rough or stern in manner or speech."

The definition for disconcert is "To throw into confusion." Used in a sentence: Jennifer's outspoken criticism of the meal disoncerted the waiter. The definition for authoritarian is "favoring absolute obedience to authority.", the definition for dubious is "Questionable.", and the definition for drub is "To defeat decisively."