People who are demonstrative easily and clearly show their emotions. A demonstrative person might shout "Hooray" and jump for joy at good news. A non-demonstrative person might feel no less excited, but refrain from demonstrating it.

To demonstrate means to show, so think of demonstrative as showing. In legal terms, demonstrative is used to describe evidence that shows that something happened––a note that says "I did it" might show, or demonstrate, an accused person's guilt. In grammar, demonstrative pronouns––this, that, these, those––indicate the thing or person that is being pointed out, or shown, as in “Officer, it was ‘that’ man who stole my purse!”

Definitions of demonstrative
  1. noun
    a pronoun that points out an intended referent
    synonyms: demonstrative pronoun
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    type of:
    a function word that is used in place of a noun or noun phrase
  2. adjective
    serving to demonstrate
    synonyms: illustrative
    informative, instructive
    serving to instruct or enlighten or inform
  3. adjective
    given to or marked by the open expression of emotion
    “an affectionate and demonstrative family”
    effusive, gushing, gushy
    extravagantly demonstrative
    epideictic, epideictical
    designed primarily for rhetorical display
    not cautious or reticent
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    not given to open expression of emotion
    restrained, reticent, unemotional
    cool and formal in manner
    marked by self-restraint and reticence
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