responsive

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
    sensitive
    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”
    Synonyms:
    answering, respondent
    replying
    sensitive
    responsive to physical stimuli
    sensitive
    being susceptible to the attitudes, feelings, or circumstances of others
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    Antonyms:
    unresponsive
    not responding to some influence or stimulus
    refractory
    temporarily unresponsive or not fully responsive to nervous or sexual stimuli
    insensitive
    not responsive to physical stimuli
    insensitive
    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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