The phrase "arguably insufficient" is correct and usable in written English.
It can be used when discussing a situation or argument where something may be considered inadequate or lacking, but there is room for debate about that assessment.
Example: "The evidence presented in the report is arguably insufficient to support the claims made by the researchers."
Alternatives: "possibly inadequate" or "potentially lacking".
"Technology, by itself, was," he told his audience, "arguably insufficient to explain growth in the past.
And this task seems always to result either in claims about the immediate graspability of aesthetic properties, which are arguably insufficient to the task, or in claims about the essentially formal nature of aesthetic properties, which are arguably groundless.
A single interval of about a decade in length is arguably insufficient to either confirm a new pattern for an epidemiological transition or refute it.
He is right to stress that Brazil's central economic challenge is to return to growth a need to which the IMF agreement arguably pays insufficient attention.
While mean expected coverage is comparable for the exonic and MHC regions, the TxArray provides a significantly improved coverage of markers across the KIR locus, which has been a region that has arguably received insufficient attention in most transplant association studies.
Arguably, though, this is insufficient support.
It'd be beyond insufficient and arguably negligent.
Although insufficient bone coverage could arguably be attributable to a poor surgical technique, we would tend to agree with other authors that it is rather likely to result from a flawed implant design that impedes osseointegration.
(However, an ethic of caring doesn't favor social conservatism in the way much communitarian thought does: any social structure that shows insufficient concern for one group or another can arguably be criticized via the ideal of mutual caring).
Findings suggest higher levels of awareness about warning signs of cancer than in the general public even when demographics are taken into account, although arguably even these high levels of cancer awareness may be insufficient to maximise the benefits to patients, clients and the general public.
"If you look carefully at the Edison action, had the S.E.C. taken that kind of approach years ago -- the approach that formal compliance with GAAP is insufficient -- and had that message gotten out loud and clear, arguably you could have stopped Enron.
