• (adv.) In a manner fitted to demonstrate; clearly; convincingly; forcibly.
De·mon'stra·tive·ly adverb In a manner fitted to demonstrate; clearly; convincingly; forcibly. 
[adv] - in a demonstrative manner
demonstratively In a demonstrative manner: 'Her husband greeted her demonstratively with a big hug.'
adverb in a demonstrative manner; `he greeted her demonstratively`