The definition for dubious is "Questionable." Used in a sentence: Karl found Kevin's claim that he was sick dubious, as he had just seen him playing football. The definition for avian is "relating to birds.", the definition for obnoxious is "Highly offensive.", and the definition for inviolable is "Secure from assault of trespass."

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 mundane is "practical, ordinary.", the definition for stern is "Harsh, severe.", and the definition for demean is "To lower status."

The definition for implement is "To carry out or accomplish." Used in a sentence: All Randolph needed to implement his plan was a moonless night and a long rope. The definition for repentant is "feeling regret.", the definition for indecorous is "In bad taste.", and the definition for moderate is "Tending toward the average."

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 futile is "without purpose, completely ineffective.", the definition for foil is "One that enhances or underscores by contrast.", and the definition for euphoria is "Feeling of great happiness."

The definition for implausible is "Unbelievable." Used in a sentence: Claudia's implausible excuse failed to convince her teacher. The definition for gargantuan is "gigantic.", the definition for eloquent is "Fluent, expressive.", and the definition for augment is "To make greater."