The definition for oblivious is "Lacking awareness." Used in a sentence: Love–struck Charlie was oblivious to everyone but the object of his affection. The definition for liability is "a person or thing whose presence or behavior is likely to cause embarrassment or put one at a disadvantage.", the definition for preclude is "To rule out in advance.", and the definition for gargantuan is "Gigantic."

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 mandate is "an official order or commission to do something.", the definition for methodical is "Performed in an orderly manner.", and the definition for condone is "To treat as acceptable."

The definition for drab is "Dull, monotonous." Used in a sentence: The drab winter scene made Keisha long for the vibrant colors of spring. The definition for naive is "lacking worldy wisdom.", the definition for mandate is "An official order or commission to do something.", and the definition for implausible is "Unbelievable."

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 procrastinate is "to put off intentionally.", the definition for iridescent is "Having a lustrous or attractivve quality.", and the definition for revoke is "To cancel by taking back."

The definition for derivative is "Lacking originality." Used in a sentence: Critics panned the movie as a derivative version of last year's Best Picture. The definition for civility is "politeness.", the definition for corrosive is "Bitingly sarcastic.", and the definition for aesthete is "Person having or affecting sensitivity to beauty."