I've tried scouring through various Japanese dictionaries with no luck.
For some context: Person A has just heard person B and C have gotten married:
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It's a dialect called 尾道弁, which is being widely used by people who live around 尾道市（広島県南東部）.
いんやぁ 嫌だ。(例1.いんやぁ、しとうないわぁ)/ 言いなさい。(例2.あの人に、いんやぁ)
Resource quoted: https://bisan.co.jp/%E3%81%93%E3%82%8C%E3%81%8C%E5%B0%BE%E9%81%93%E5%BC%81%E3%81%98%E3%82%83-p-onoken005/ (これが尾道弁じゃ)