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 raucous is "noisy, rowdy.", the definition for regurgitate is "To pour out or throw back.", and the definition for diffident is "Lacking self–confidence."

The definition for serenity is "Calmness." Used in a sentence: The serenity of the glassy sea soothed the sailors after the big storm. The definition for lenient is "mild or tolerant.", the definition for camaraderie is "Spirit of friendship.", and the definition for archaic is "Characteristic of an earlier time."

The definition for meticulous is "Extrememly careful regarding details." Used in a sentence: The meticulous detective found every shred of evidence at the crime scene. The definition for corroborate is "to support with evidence.", the definition for derelict is "Abandoned.", and the definition for inviolable is "Secure from assault of trespass."

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 incongruous is "not harmonious, incompatible.", the definition for mediate is "To come between parties in order to reconcile.", and the definition for stern is "Harsh, severe."

The definition for regale is "To amuse." Used in a sentence: My clever brother Jeffrey regaled the dinner guests with tales of his adventures. The definition for periodic is "occurring at regular intervals.", the definition for accessible is "Easy to reach or to approach.", and the definition for demean is "To lower status."