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Adjective: attentive  u'ten-tiv
  1. (often followed by 'to') giving care or attention
  2. Taking heed; giving close and thoughtful attention
    - heedful, thoughtful, paying attention

See also: absorbed, advertent, attention, attentiveness, captive, concerned, engrossed, enwrapped, heed, heedful, intent, observant, oversolicitous, paying attention, regard, solicitous, wrapped

Antonym: inattentive