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The phrase "however careful" is grammatically correct and can be used in written English.
It is typically used to introduce a contrast or exception to the previous statement. Example: "She had studied for hours; however, careful as she was, she still made a few mistakes on the exam."
Exact(60)
However, careful analysis would lead to the winning play.
Sheikh Nimr was, however, careful to avoid calling for violence.
He was, however, careful to avoid calling for violence, analysts say.
However careful Kilcullen is not to criticize Administration policy, his argument amounts to a thoroughgoing critique.
But however careful he was, there was a chance of something going wrong and the bird getting hurt.
However careful you are about your health, your body is almost certainly home to troubling chemicals called phthalates.
However, careful follow-up is required.
However, careful discussion of magmatic thermal effects is required.
However, careful follow-up is required to avoid symptom recurrence.
However, careful consideration of the multi-path effect is essential for shipborne GNSS observations.
However, careful management is essential for making optimum use of the vegetation.
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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