Usage of 'mortally'

[Daemon99]

I am mortally surprised.

How does this line sound to you? Is it OK to say so? Please help.
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Non-native speaker of English
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I intend to live forever - so far, so good.

[Yankee]

Hi Daemon

That sounds awkward to my ear. 'Mortally' is used in a few extremely typical collocations, so maybe that's the only reason that 'mortally surprised' sounds odd to me.

These would sound very typical to me:
- mortally afraid
- mortally wounded
.
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"Nearly all men can stand adversity, but if you want to test a man's character, give him power." ~ Abraham Lincoln

[Lost_Soul]

Hi, Amy

Does it sound "poetic" to you ?
I know that poets resort to weird collocations to make special effects, but at the same time some weird collocations are just plain mistakes by non-native speakers. So which is it?