reflex

Phonetic Respelling: [ adjective, noun ree-fleks; verb ri-fleks ]

Definition:

n. an automatic instinctive unlearned reaction to a stimulus; adj. doing without a mindful awareness

Sentence:

Blinking his eyes was a reflex action.

More example sentences:

Blinking his eyes was a reflex action.

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The optokinetic reflex allows the eye to follow objects in motion.

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Tapping your knee creates an involuntary reflex.

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We learned about a reflex angle in our math lesson.

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Synonyms:

automatic; involuntary; instinctive

Antonyms:

controlled; voluntary