The phrase "allegedly weak" is correct and usable in written English.
It can be used when discussing claims or assertions about someone's weakness that have not been proven or confirmed.
Example: "The athlete's performance was allegedly weak, leading to speculation about their training regimen."
Alternatives: "reportedly weak" or "supposedly weak".
In the third essay, Nietzsche focusses upon the truth-oriented ascetic ideals that underlie and inform prevailing styles of art, religion and philosophy, and he offers a particularly scathing critique of the priesthood: the priests are allegedly a group of weak people who shepherd even weaker people as a way to experience power for themselves.
I packed my bags and moved to a country with serially-weak and allegedly corrupt governments, presenting a new set of challenges.
Without the video, you've got nothing but a weak primer on Madonna (allegedly in control), Nicki Minaj (allegedly funny), and M.I.A. (allegedly controversial).
And the zippers, the weak spot of many allegedly waterproof backpacks, are specially designed to be leak-proof.
Record companies are showing their weak hand as they sue four students who allegedly helped their peers download music online.
In the face of this weak testimony, as well as waning public interest, the prosecution allegedly failed to press its case very hard.
Meanwhile, opponents of LulzSec released information last weekend that was allegedly taken from the group's computer system -- an embarrassing development given that LulzSec has said organizations with weak security deserve to be hacked.
Some of those problems concern the allegedly implausible consequences that emerge when we apply some of the transmission principles we discuss in §2 above specifically, Ought Necessity, Weak Reasons Necessity, and Weak Reasons Sufficiency to the relevant wide-scope ought in certain cases.
Mr. Obama allegedly does not.
