The Oxford Thesaurus An A-Z Dictionary of Synonyms - demonstrativeadj.

1) open, unrestrained, unconstrained, unreserved, expansive, effusive, emotional, warm, tender, affectionate, loving: Pat is quite demonstrative, often causing me to blush. 2 illustrative, indicative, representative, probative, evidential; provable, evident: Her point was proved by several demonstrative arguments. The hostility of these few is demonstrative of what to expect of the entire group.