Scottish dialect: struck, hit, or affected by something; dazed or stunned from impact.
Possibly from 'doner' or related dialectal roots meaning to strike or affect, with the '-ed' suffix indicating a state of having been struck or affected.
Scottish dialect preserved lots of old English and Norse words, and 'donnered' is one of those words that perfectly captures what happens when someone gets hit—not just physically but metaphorically, like being 'donnered' by bad news.
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