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unwillingly; reluctantly; grudgingly
shaking one's head in refusal (like a child)
いやいや手伝わされた掃除が思ったより早く終わった。
The cleaning I was reluctantly made to help with ended sooner than expected.
いやいやながらも約束を守るのが彼の誠実さだ。
His integrity shows in keeping promises even when reluctant.
いやいや読み始めた本が面白くて止まらなかった。
The book I reluctantly started reading was so interesting I could not stop.