Meaning

adjective pathetically lacking in force or effectiveness

adjective lacking strength or vigor

adjective lacking bodily or muscular strength or vitality

originEtymology tree Anglo-Norman feblebor. Middle English feble English feeble From Middle English feble, from Anglo-Norman feble (“weak, feeble”) (compare French faible), from Latin flēbilis (“tearful, mournful, lamentable”) by dissimilation, from fleō (“to weep, cry”), ultimately from Proto-Indo-European *bʰleh₁-. Doublet of foible.

Etymology from Wiktionary, CC BY-SA 3.0