attenuated

adjective3

1. •
   Made, or become weak; subject to attenuation.

   • She had become spiritualized in mind, even as she had grown attenuated in person. — 1835
2. •
   Weakened, usually in a way that includes nonreplicating status.

   • the live attenuated type of vaccines
3. •
   Long and tapering (especially of leaves)