I accept both as correct. Personally, I would use "proud". Others may have differing opinions.
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Blue Jaymost dictionaries seem to list only proudly as an adverb.That doesn't matter. If you don't like calling it an adverb you can consider it an adjective and say it's a subject-oriented secondary predicate.
CalifJimIf you don't like calling it an adverb you can consider it an adjective and say it's a subject-oriented secondary predicate.Just because it's dressed up as an adjective doesn't mean I'm going to insult it by calling it a subject-oriented secondary predicate. Parts of speech have feelings too, you know.
CalifJimSurely you don't want 'nakedly' there, do you?No, I generally prefer the -ly forms, but sometimes the "naked" form works better. I wouldn't exhort someone to Work hardly. In the case of proud, though, stand proud (to me) means stick up. It sounds wrong to me to say "stand up proud" to mean "stand up proudly".
Blue JayIt sounds wrong to me to say "stand up proud" to mean "stand up proudly".Same here. I don't know why, but the addition of "up" changes my perception of it completely.