fragile

adjective
frag*ile \ ˈfra-jəl \ -ˌjī(-ə)l \
1521{ds||1|a|}
  • easily broken or destroyed
  • constitutionally delicate : lacking in vigor
  • tenuous, slight

fragile X syndrome

noun
fragile X syndrome \
1979
  • an X-linked inherited disorder that is characterized especially by moderate to severe intellectual and developmental disabilities, an elongated face and prominent forehead, chin, and ears, and by large testes in males, and that often has limited or no effect in heterozygous females
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