weak as a cat—(also: weak as a kitten) lacking in physical strength:
- He must have been as weak as a kitten, with all the blood he’d lost.
weak as water —(also: weak as dishwater)
1. = weak as a cat:
- Sir, I am only just getting well of a fever, and I am as weak as water.
2. lacking in determination; easily influenced by other people:
- You love Eva, and Eva loves you, Ernest; but remember this, she is weak as water.
3. (of tea, etc.) watery; not having enough flavor:
- These poor and hungry people are accustomed to drinks almost as weak as water.
4. (of an evidence, etc.) not convincing; inefficient:
- His brashness couldn’t cover the fact that his argument was weak as water.