The definition for opportune is "Suitable or convenient." Used in a sentence: Quan stepped onto the platform at the most opportune time, just as the train pulled in. The definition for ethical is "conforming to accepted standards.", the definition for naive is "Lacking worldy wisdom.", and the definition for retroactive is "effective as of a prior time or condition."

The definition for curtail is "To make less." Used in a sentence: Doreen decided to curtail her spending after she bounced a check. The definition for straddle is "to favor opposing sides.", the definition for facade is "false or superficial appearance.", and the definition for stern is "Harsh, severe."

The definition for repentant is "Feeling regret." Used in a sentence: The repentant Dana admitted to cheating on the test. The definition for combustion is "act of burning.", the definition for appalling is "Inspiring dismay or disgust.", and the definition for flourish is "To make bold, sweeping gestures."

The definition for heinous is "Shockingly evil." Used in a sentence: Eduardo's heinous betrayal of Lydia shocked even Latasha, who knew his evil ways. The definition for scapegoat is "someone who bears the blame for others.", the definition for incumbent is "Necessary as a duty or responsibility.", and the definition for drab is "Dull, monotonous."

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 scapegoat is "someone who bears the blame for others.", the definition for untenable is "Not able to be defended.", and the definition for incisive is "Impressively direct and decisive."