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"however scarce" is correct and usable in written English.
You can use it to indicate that something is present, but not in large amounts. For example: "We had very little food; however scarce, we managed to make a meal."
Exact(60)
Such pools are, however, scarce commodities.
However, scarce resources and an absence of international support mean these organisations struggle to survive.
However, scarce of attentions were paid to this fundamental problem.
The evidence of its effectiveness is, however, scarce.
There is however scarce evidence in septic rats that this threshold corresponds to imminent death.
Information about the effect of β-glucans from LAB is however scarce.
However, scarce research has been detected in literature regarding end-of-life membrane management.
However, scarce data are present on the clinical parameters associated with this phenomenon.
Basic knowledge about its impact on motor system oscillations and functional connectivity is however scarce.
However scarce RT-qPCR protocols are properly validated leading to inconsistent data analyses.
Methods to embrace chromatographic information and to combine it with HRMS data for signal series detection are however scarce.
Write better and faster with AI suggestions while staying true to your unique style.
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com