The definition for diffident is "Lacking self–confidence." Used in a sentence: The diffident student never raised her hand in class, even when she knew the answer. The definition for rehash is "to discuss again.", the definition for periodic is "Occurring at regular intervals.", and the definition for placebo is "An inactive substance used in medical testing."

The definition for preclude is "To rule out in advance." Used in a sentence: "Having cake now will preclude dessert later," said Amber's mother. The definition for condone is "to treat as acceptable.", the definition for aesthete is "Person having or affecting sensitivity to beauty.", and the definition for advantageous is "Giving an advantage."

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 sociable is "inclined to seek companionship.", the definition for extol is "To praise highly.", and the definition for fickle is "Lacking constancy, changeable."

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 heinous is "shockingly evil.", the definition for perception is "Capacity for seeing or understanding.", and the definition for buffer is "Protective barrier."

The definition for awe is "Emotion combining dread and wonder." Used in a sentence: Charlie was in awe of his uncle, a professional football player and chess champion. The definition for scapegoat is "someone who bears the blame for others.", the definition for promote is "To contribute to the growth or prosperity of.", and the definition for raucous is "Noisy, rowdy."