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 nurture is "to further the development of.", the definition for illuminate is "To make clear.", and the definition for serenity is "Calmness."

The definition for sociable is "Inclined to seek companionship." Used in a sentence: The sociable Glenda was delighted to receive the party invitation. The definition for clarity is "clearness.", the definition for augment is "To make greater.", and the definition for revoke is "To cancel by taking back."

The definition for foil is "One that enhances or underscores by contrast." Used in a sentence: The sweet cookie was a perfect foil to the sour lemon sorbet. The definition for proximity is "closeness.", the definition for incongruous is "Not harmonious, incompatible.", and the definition for gruff is "Rough or stern in manner or speech."

The definition for catastrophic is "Relating to extreme misfortune." Used in a sentence: The effects of the massive hurricane were catastrophic. The definition for implausible is "unbelievable.", the definition for proximity is "Closeness.", and the definition for prudent is "Marked by wisdom, shrewd."

The definition for civility is "Politeness." Used in a sentence: The usually unruly Thomas acted with great civility when his favorite uncle visited. The definition for ethical is "conforming to accepted standards.", the definition for pretentious is "Making unjustified claims.", and the definition for elusive is "Hard to grasp."