People who are responsive are alert and aware — they've giving responses. The least responsive people in the world are people in deep comas.

Responsive has several meanings, but they're very similar. If someone just came out of a coma and starting saying anything at all (or even started blinking), you'd be happy at how responsive they are. A person who has enthusiasm is more responsive than someone who is quiet and seems bored. Things other than people can be responsive too: a plant is responsive to sunlight, and the fire department is responsive to a fire. Anything that is alert and quick to react is responsive.

Definitions of responsive
  1. adjective
    reacting to a stimulus
    synonyms: reactive
    responsive to physical stimuli
  2. adjective
    readily reacting or replying to people or events or stimuli; showing emotion
    “children are often the quickest and most responsive members of the audience”
    answering, respondent
    responsive to physical stimuli
    being susceptible to the attitudes, feelings, or circumstances of others
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    not responding to some influence or stimulus
    temporarily unresponsive or not fully responsive to nervous or sexual stimuli
    not responsive to physical stimuli
    deficient in human sensibility; not mentally or morally sensitive
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  3. adjective
    containing or using responses; alternating
    responsive reading”
    synonyms: antiphonal
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