more feeble, impotent, sick, without strength, weak(-er, -ness, thing)

Strong’s Dictionary of Greek Words:

Greek:
ἀσθενής
Transliteration:
asthenes
Phonic:
as-then-ace’
Meaning:
from 1 (as a negative particle) and the base of 4599; strengthless (in various applications, literal, figurative and moral)
KJV Usage:
more feeble, impotent, sick, without strength, weak(-er, -ness, thing)