An adverb meaning "one thing or another" or "this and that"; often used in phrases like 'after all' or 'despite complaints'.
みんな、なんだかんだ言って結局協力してくれた。
After all their complaints, everyone ended up helping out.
なんだかんだで会議が長引いてしまった。
For one reason or another, the meeting ended up running long.
彼とはなんだかんだ仲がいい。
He and I, despite everything, get along well.