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 stifle is "to repress or discourage.", the definition for refurbish is "To brighten or freshen.", and the definition for gargantuan is "Gigantic."

The definition for turmoil is "Extreme confusion, agitation." Used in a sentence: The windstorm caused such turmoil in the lake that the sailboat capsized. The definition for combustion is "act of burning.", the definition for impenitent is "Lacking remorse.", and the definition for catastrophic is "Relating to extreme misfortune."

The definition for parity is "Equality." Used in a sentence: Hilda, to avoid squabbles, aimed for parity in the slices of birthday cake. The definition for meticulous is "extrememly careful regarding details.", the definition for facade is "false or superficial appearance.", and the definition for incisive is "Impressively direct and decisive."

The definition for pallid is "Lacking color." Used in a sentence: The nurse was worried by the patient's pallid face and shallow breathing. The definition for insinuate is "to suggest indirectly.", the definition for incongruous is "Not harmonious, incompatible.", and the definition for raucous is "Noisy, rowdy."

The definition for impenitent is "Lacking remorse." Used in a sentence: The impenitent criminal received a harsh penalty, but his remorseful accomplice was released. The definition for extol is "to praise highly.", the definition for flaw is "An imperfection.", and the definition for dubious is "Questionable."