English to English

adjective (a)

• not mentally confused; able to think clearly and act intelligently

  mental tidak bingung; bisa berpikir jelas dan bertindak secara cerdas

  Synonym:
  clear-thinking
  Antonym:
  confused
  

  source: wordnet30
• Having a clear understanding; quick of perception; intelligent.

  memiliki pemahaman yang jelas; cepat dari persepsi; cerdas.

  source: webster1913