attenuated

adjective

Made, or become weak; subject to attenuation.
“attenuated power”
“He had his tea and hot rolls in a morning, while we were battening upon our quarter of a penny loaf—our crug—moistened with attenuated small beer, in wooden piggins, smacking of the pitched leathern jack it was poured from.”
Made, or become weak; subject to attenuation.
“Near-synonym: nonreplicating (often synonymous)”
“the live attenuated type of vaccines”
Long and tapering (especially of leaves)