(as) weak as a kitten

(as) weak as a kitten

Especially weak, feeble, and vulnerable; completely unable to defend oneself. The heart attack left me bedridden and weak as a kitten for nearly a month. Tom's always been as weak as a kitten, so we don't bother trying to roughhouse with him at all.
See also: kitten, weak

weak as a kitten

Feeble and fragile, as in After that bout with flu she was weak as a kitten. This simile has largely replaced weak as a cat, from the early 1800s.
See also: kitten, weak