The phrase "admittedly weak" is correct and usable in written English.
It can be used when acknowledging a weakness or flaw in an argument, idea, or situation.
Example: "The evidence presented in the report is admittedly weak, which raises questions about its validity."
Alternatives: "undeniably weak" or "acknowledged as weak".
Last year I made an (admittedly weak) application to Cambridge and was inevitably rejected post-interview.
They had shown glimpses of their attacking threat - a turn and, admittedly, weak shot from Walcott - but when Gervinho got past Medhi Benatia on the byline there were Arsenal players queuing up in the area.
(A fairer assessment might set the fact of some admittedly weak teams against a gruelling schedule and inhospitable venues, plus teams who know each other to the extent that shared history creates its own challenges).
It became too much to ignore when he climbed to the top of the Republicans' admittedly weak field of presidential contenders and serious minds began to suggest that there was some virtue in his opportunistic vicissitudes about the president and his policy.
The expansion of waves provides an (admittedly) weak approximation to correlations (see Fig. 3) related to the Breit Wigner approximation.
The purchase will help Facebook build up monetization prowess on mobile platforms — an area it's admittedly weak in.
Although sub-cortical auditory connections go through essentially two 'chiasma', one at the connection from CN to SOC and another at connection from SOC to IC, it is well understood that there are (admittedly weaker) ipsilateral as well as contralateral connections throughout.
Mr Thune won his two previous elections overwhelmingly, with three-quarters of the vote (admittedly against weak opponents).
Amid the gloom, the economy is getting "Better, Stronger, Faster", argues Daniel Gross, in a book of that name published this week.Politics is, admittedly, a weak point.
Laurent Blanc was able to start all three for the first time on Tuesday and, admittedly against weak opposition, they whet the appetite for feasts to come.
I like some of the games, but some of them are admittedly very weak.
