Meaning of natural fool in English:

natural fool

Pronunciation /ˌnatʃ(ə)rəl ˈfuːl/ /ˌnatʃ(ə)r(ə)l ˈfuːl/

noun

archaic, historical
  • A person who is deficient in intelligence from birth; a person born with a mental handicap.

Origin

Late Middle English; earliest use found in The Alphabet of Tales. From natural + fool.