The definition for futile is "Without purpose, completely ineffective." Used in a sentence: Arguing with Andrew is futile because he never changes his mind. The definition for oblivious is "lacking awareness.", the definition for rancorous is "Marked by deep ill–will.", and the definition for polarize is "To break up into opposing groups."

The definition for extenuating is "Partially excusing." Used in a sentence: The extenuating circumstance of Calvin's illness caused the teacher to excuse his lateness. The definition for derivative is "lacking originality.", the definition for drub is "To defeat decisively.", and the definition for trove is "Valuable collection."

The definition for unscrupulous is "Lacking principles." Used in a sentence: The unscrupulous salesman was fired for lying to his customers. The definition for ecstatic is "overwhelmingly emotional.", the definition for iridescent is "Having a lustrous or attractivve quality.", and the definition for disconcert is "To throw into confusion."

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 equitable is "fair and equal.", the definition for implement is "To carry out or accomplish.", and the definition for turmoil is "Extreme confusion, agitation."

The definition for augment is "To make greater." Used in a sentence: Wanda read the dictionary every night to augment her vocabulary. The definition for rail is "to scold in harsh language.", the definition for incumbent is "Necessary as a duty or responsibility.", and the definition for implausible is "Unbelievable."