The phrase "again weaker than" is correct and usable in written English.
It can be used when comparing the strength or effectiveness of something to another, indicating that it is weaker in a repeated context.
Example: "The new policy is again weaker than the previous one, failing to address the core issues."
Alternatives: "once more less effective than" or "repeatedly inferior to".
"Today's forecast from the OBR confirms that wage growth is once again weaker than expected.
"Today's forecast from the Office for Budget Responsibility confirms that wage growth is once again weaker than expected," he said.
"With the projected pickup in growth being once again weaker than previously expected and the balance of risks remaining tilted to the downside, raising actual and potential output through a mix of demand support and structural reforms is even more urgent," the IMF said.
Looking at forecasts for 2003, he said earnings growth would once again be weaker than investors hoped.
But business investment growth is again going to come in weaker than expected, making the path to better balanced growth an uphill one.
The shadow chancellor said the Office for Budget Responsibility's (OBR) new figures announced today show again that wage growth is weaker than expected, which is in turn hitting tax revenues.
Again, however, this effect is weaker than for core intervals.
Again, BSO clustering was noticeably weaker than that seen for northern Africans, suggesting a greater degree of interindividual variation.
However, we must highlight once again that the Charter is weaker than other instruments such as the Constitution of the Portuguese Republic, the European Social Charter and the Council of Europe's Convention for the Protection of Human Rights and Fundamental Freedoms, which are internationally valid, more comprehensive and recognised as legitimate.
Spanish Prime Minister José Luis Rodriguez Zapatero, who broke off meetings in Brussels and returned to Madrid following the attack, said, "We knew that it could happen again, even though the terrorists are weaker than ever".
Again, sensitivity and precision are significantly weaker than when we used selected restrictive physicochemical and compositional properties (Table 2).
