also: やや
interjection
Kansai dialect interjection expressing refusal, rejection, or strong dislike. Equivalent to standard Japanese 嫌だ or やだ. Often used in casual, emotional contexts.
「一緒に行かへん？」「いやや、行きたない。」
"Won't you come with me?" "No, I don't want to go."
そんなんいやや！
I don't want that! / No way!
Standard Japanese adjective meaning 'disagreeable' or 'unpleasant'. いやや is the Kansai dialect equivalent of 嫌だ or やだ, used as an interjection.
Kansai dialect copula, equivalent to だ. Combined with いや to form いやや, meaning 'it's unpleasant' or 'I don't like it'.
Kansai dialect contraction of 嫌 (iya, 'disagreeable') + や (ya, dialectal copula). The alternate reading やや is a further reduction.