The definition for catastrophic is "Relating to extreme misfortune." Used in a sentence: The effects of the massive hurricane were catastrophic. The definition for periodic is "occurring at regular intervals.", the definition for placebo is "An inactive substance used in medical testing.", and the definition for appraise is "To evaluate the worth of."

The definition for antidote is "Something that relieves or counteracts." Used in a sentence: Veronique found that listening to French music was an antidote for her homesickness. The definition for compulsion is "an irresistible impulse.", the definition for egotist is "Self–important person.", and the definition for benefactor is "One who offers financial help."

The definition for futile is "Without purpose, completely ineffective." Used in a sentence: Arguing with Andrew is futile because he never changes his mind. The definition for melodious is "having a pleasing melody.", the definition for embellish is "To decorate.", and the definition for repentant is "Feeling regret."

The definition for repel is "To resist, reject." Used in a sentence: The soldiers made a massive charge to repel the invaders. The definition for repel is "to resist, reject.", the definition for regurgitate is "To pour out or throw back.", and the definition for demeanor is "Behavior towards others."

The definition for appalling is "Inspiring dismay or disgust." Used in a sentence: Hector found his roommate's habit of leaving his dirty socks on the floor appalling. The definition for commemorate is "to mark by a ceremony.", the definition for aesthete is "Person having or affecting sensitivity to beauty.", and the definition for futile is "Without purpose, completely ineffective."