The definition for corroborate is "To support with evidence." Used in a sentence: "Unless you can corroborate your story, it will not be admissible in court," the attorney told his client. The definition for derivative is "lacking originality.", the definition for clairvoyance is "Ability to see things beyond ordinary perception.", and the definition for extant is "Currently existing."

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 appraise is "to evaluate the worth of.", the definition for combative is "Eager to fight.", and the definition for redouble is "To make twice as great."

The definition for gruff is "Rough or stern in manner or speech." Used in a sentence: Heidi's grandfather was gruff, barking stern orders and hardly smiling. The definition for unscrupulous is "lacking principles.", the definition for entangle is "To involve in trouble.", and the definition for buffer is "Protective barrier."

The definition for civility is "Politeness." Used in a sentence: The usually unruly Thomas acted with great civility when his favorite uncle visited. The definition for entangle is "to involve in trouble.", the definition for redouble is "To make twice as great.", and the definition for immoderate is "Beyond usual or proper limits."

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 finite is "having definite limits.", the definition for turpitude is "Essential baseness, depravity.", and the definition for eulogy is "Speech or writing in praise of deceased."