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When Eva was first diagnosed with diabetes she was twenty.

When Eva was firstly diagnosed with diabetes she was twenty.

Which one is grammatically correct to say and as I know both first and firstly we can use as an adverb.

marked as duplicate by FumbleFingers, user140086, Mari-Lou A, ab2 ReinstateMonicaNow, tchrist Jul 10 '16 at 2:08

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Both appear to be correct as adverb form of firstly appears to be a synonym of adverb form of first. https://en.m.wiktionary.org/wiki/firstly

However, I saw only first being used the way you used it. The second form using firstly looks clumsy to me but it may just be that I am not used to it.

I only saw firstly used in the sense of "in the first place".

If you have no specific reason to prefer firstly, perhaps you should prefer using first to avoid any confusion.

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