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 periodic is "occurring at regular intervals.", the definition for aesthete is "Person having or affecting sensitivity to beauty.", and the definition for inauspicious is "Not favorable."

The definition for serenity is "Calmness." Used in a sentence: The serenity of the glassy sea soothed the sailors after the big storm. The definition for extenuating is "partially excusing.", the definition for oblivious is "Lacking awareness.", and the definition for pallid is "Lacking color."

The definition for gargantuan is "Gigantic." Used in a sentence: The gargantuan monster towered over the ten–story bulding. The definition for gargantuan is "gigantic.", the definition for comparable is "Similar, equivalent.", and the definition for regale is "To amuse."

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 civility is "politeness.", the definition for stifle is "To repress or discourage.", and the definition for inviolable is "Secure from assault of trespass."

The definition for intricate is "Having complex and interrelated parts." Used in a sentence: The intricate poem baffled most readers with its numerous obscure metaphors. The definition for impenitent is "lacking remorse.", the definition for comparable is "Similar, equivalent.", and the definition for heinous is "Shockingly evil."