The definition for incongruous is "Not harmonious, incompatible." Used in a sentence: Sadie's cowboy hat was incongruous with her black cocktail dress. The definition for beneficial is "helpful.", the definition for heinous is "Shockingly evil.", and the definition for sociable is "Inclined to seek companionship."

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 accessible is "easy to reach or to approach.", the definition for mandate is "An official order or commission to do something.", and the definition for augment is "To make greater."

The definition for accessible is "Easy to reach or to approach." Used in a sentence: The introduction to the complex novel was, thankfully, written in clear accessible language. The definition for melee is "a tumultuous fight among several people.", the definition for flourish is "To make bold, sweeping gestures.", and the definition for insolence is "Boldness or rudeness."

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 advantageous is "giving an advantage.", the definition for untenable is "Not able to be defended.", and the definition for straddle is "To favor opposing sides."

The definition for serenity is "Calmness." Used in a sentence: The serenity of the glassy sea soothed the sailors after the big storm. The definition for oblivious is "lacking awareness.", the definition for penurious is "Extrememly stingy.", and the definition for repel is "To resist, reject."