The definition for corroborate is "To support with evidence." Used in a sentence: "Unless you can corroborate your story, it will not be admissible in court," the attorney told his client. The definition for retroactive is "effective as of a prior time or condition.", the definition for untenable is "Not able to be defended.", and the definition for nurture is "To further the development of."

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 augment is "to make greater.", the definition for immoderate is "Beyond usual or proper limits.", and the definition for condone is "To treat as acceptable."

The definition for colossal is "Immense, enormous." Used in a sentence: After pushing with all his might, Frank realized he could never move the colossal boulder. The definition for appalling is "inspiring dismay or disgust.", the definition for epitaph is "Brief statement honoring a dead person.", and the definition for servile is "Fearfully submissive."

The definition for scamper is "To run quickly." Used in a sentence: The frightened kitten scampered away from the butterfly. The definition for aesthete is "person having or affecting sensitivity to beauty.", the definition for beneficial is "Helpful.", and the definition for heed is "To pay attention to."

The definition for corrective is "Intended to correct." Used in a sentence: The school decided to take corrective measures to prevent truancy. The definition for methodical is "performed in an orderly manner.", the definition for procrastinate is "To put off intentionally.", and the definition for scapegoat is "Someone who bears the blame for others."