いいや

interjection

no; nope

Emphatic, casual denial. Stronger than いいえ; often used when rejecting an offer or correcting a misunderstanding.

• 「もう一いっ杯ぱいどう？」「いいや、結けっ構こうです。」

  "How about another drink?" "No, I'm fine."

• 「これ、君きみの？」「いいや、違ちがうよ。」

  "Is this yours?" "Nope, it's not."