reflex

noun

an automatic instinctive unlearned reaction to a stimulus
無意識的な反応

adjective

without volition or conscious control
意志も意識的なコントロールもなしで
- the automatic shrinking of the pupils of the eye in strong light
  強い光における、目の瞳孔の自動萎縮
- a reflex knee jerk
  膝蓋腱反射
- sneezing is reflexive
  くしゃみは反射的である

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