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 civility is "politeness.", the definition for corroborate is "To support with evidence.", and the definition for archetypal is "Characteristic of the original model or perfect example."

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 retroactive is "effective as of a prior time or condition.", the definition for combustion is "Act of burning.", and the definition for accentuate is "To emphasize."

The definition for duplicity is "Deceptive thought, speech, or action." Used in a sentence: The life of an undercover detective is filed with necessary duplicity. The definition for obnoxious is "highly offensive.", the definition for comprehensible is "Understandable.", and the definition for inviolable is "Secure from assault of trespass."

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 penurious is "extrememly stingy.", the definition for incisive is "Impressively direct and decisive.", and the definition for serenity is "Calmness."

The definition for avian is "Relating to birds." Used in a sentence: The old man affectionately referred to pigeons as his "avian friends." The definition for eulogy is "speech or writing in praise of deceased.", the definition for diffident is "Lacking self–confidence.", and the definition for ramble is "To wander, physically or in language."