'exceptionally weak' is correct and can be used in written English.
You can use this phrase to describe something that is particularly weak or inferior compared to other things. For example, "The team's performance in the competition was exceptionally weak for their usual standard."
The weakness in activity has also been accompanied by exceptionally weak productivity.
"Underlying growth remains exceptionally weak".
Sterling was exceptionally weak in 1996-97, and prices for farm goods very high.
In an exceptionally weak draft for linebackers, Bailey could be the only one taken in the first round on Saturday.
Few in Russia expect the two men to be exonerated, unless the prosecution makes an exceptionally weak case.
Economies can grow even when productivity is exceptionally weak, as it has been in the years since the global recession.
Thus, it is often presumed that because "strong thiol nucleophiles" react exceptionally well with "weak electrophiles," thiols must have a very expansive range of electrophile preference.
The commission said in its interim forecasts for 2010 that while better-than-expected global demand could further spur exports, investment remained very weak, reflecting exceptionally low capacity utilization.
In 1969 Cobb et al. reported that rat Walker 256 carcinoma cells are exceptionally sensitive to the weak monofunctional alkylating agent 5- azaridin-1-yl -2,4-dinitrobenzamide 5- azaridin-1-yl -2,4-dinitrobenzamide 5- azaridin-1-yl -2,4-dinitrobenzamide 5- azaridin-1-yl -2,4-dinitrobenzamide 5- azaridin-1-yl -2,4-dinitrobenzamide 5- azaridin-1-yl -2,4-dinitrobenzamide CB1954
It is notable that the lever arm azimuth in this case would exclude actin subunits L and M from strong myosin attachments but our results show that even non-specific, weak attachments are exceptionally low on those subunits.
Nor is much official attention given to individual support, whether for weaker or for exceptionally bright students.
