And viruses can become weak, making them useful as vaccines.
If the motivation is weak, making it easier to vote is not a cure.
Big bank stocks have been persistently weak, making breakups that seemed politically impossible no longer unthinkable.
But tax revenues remain weak, making it hard to pay for government programs and meet debt payments.
The drought has also left thousands of people malnourished and weak, making them vulnerable to infectious diseases.
As a result, the growth in domestic demand has been relatively weak, making economies even more dependent on exports.
American manufacturers have long complained that China is keeping its currency, the renminbi, artificially weak, making it harder for United States exports to compete in the global marketplace.
WASHINGTON (AP) — Americans borrowed less for a record ninth month in October, another sign that consumer spending would remain weak, making it harder for the economy to mount a sustained rebound.
He admitted consumer confidence would remain weak, making progress in broadband "even more surprising," but there was evidence of a pick-up in demand from small- and medium-sized businesses.
Because they rely on signals from satellites transmitting from an altitude of around 20,000 kilometres (12,400 miles), the signals are very weak, making them vulnerable to accidental or deliberate interference.
American and European officials have complained that China is keeping its currency artificially weak, making its exports more competitive and harming competitors trying to climb out of the recession.
