Stunned, confused, or bewildered; or struck or affected in some way.
Dialectal term possibly related to 'don' or representing a variant of 'donnard,' suggesting a state of being affected or overwhelmed, though the exact etymology is uncertain.
This is deeply regional dialect, possibly Scottish, and it's a good example of how English has hundreds of obscure words for describing emotional or mental states that most people never use but that capture very specific feelings perfectly.
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