adj. 25B6; adjective
a very demonstrative family : EXPRESSIVE, open, forthcoming, communicative, unreserved, emotional, effusive, gushing; affectionate, cuddly, loving, warm, friendly, approachable; informal touchy-feely, lovey-dovey.
the successes are demonstrative of their skill : INDICATIVE, indicatory, suggestive, illustrative.
demonstrative evidence of his theorem : CONVINCING, definite, positive, telling, conclusive, certain, decisive; incontrovertible, irrefutable, undeniable, indisputable, unassailable.
reserved, inconclusive.