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 aerate is "to supply with air.", the definition for colossal is "Immense, enormous.", and the definition for straddle is "To favor opposing sides."

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 preclude is "to rule out in advance.", the definition for solace is "Source of consolation.", and the definition for foil is "One that enhances or underscores by contrast."

The definition for stern is "Harsh, severe." Used in a sentence: The stern principal canceled the prom after the seniors played a silly prank. The definition for facade is "false or superficial appearance.", the definition for servile is "Fearfully submissive.", and the definition for ploy is "A contrived plan."

The definition for impenitent is "Lacking remorse." Used in a sentence: The impenitent criminal received a harsh penalty, but his remorseful accomplice was released. The definition for turmoil is "extreme confusion, agitation.", the definition for procrastinate is "To put off intentionally.", and the definition for iridescent is "Having a lustrous or attractivve quality."

The definition for onset is "Beginning." Used in a sentence: Crocuses bloom at the onset of spring, sometimes even before the snow melts. The definition for lenient is "mild or tolerant.", the definition for comparable is "Similar, equivalent.", and the definition for flagrant is "Noticeably offensive."