いいえ is for forms and classrooms. On stage and in real life, disagreement starts with いや, often doubled to いやいや to wave something off.
Fine almost anywhere. Doubled いやいや sounds like waving your hands.
One man plans to donate his entire savings of 130,000 yen, while the other tells him to keep it.
No, see, I go to the ATM, take out the money,
Textbookいいえ、私はATMに行って、お金を下ろします。'いいえ' becomes 'いや', a quick pushback that opens a counterpoint; '私は' turns into '俺はね', 'に' and 'を' drop, and the ending '下ろします' becomes the trailing て-form '下ろして' because the sentence keeps going.
A grandchild and Grandpa are talking about an exam that both of them seem to have taken.
Well, y'see, I found out how fun studying is, so I figured I'd go back to school.
Textbookいえ、あの、勉強の楽しさを知って、学び直しをしようと思ったんです。Casual 「いや」 stands in for 「いいえ／いえ」, here a soft 'well…' before explaining. 「思ってな」 is plain 「思って」 plus an old-man 「な」.
A performer politely tells the audience a strange story about an electric kettle that seemed to be staring at them.
and I ended up making excuses like, 'This isn't my fault. No, you've got it wrong!'
Textbook「これは私のせいではありません。いいえ、違うのです」と言い訳をしてしまったのです。'いいえ' → 'いや': the casual 'no' that launches a flustered denial, followed straight away by '違うんだよ'.
A man admits that when street touts flatter him, he gets excited and wants to follow them.
No, what do they call me?
Textbookいいえ、私は何と呼ばれているのですか。「いや」 is the casual "no" answering 「知ってます？」 ("Do you know?"), then launching the next question; textbook 「いいえ」 sounds stiff between friends.
Someone keeps begging Mom to buy them something, saying they ate their green peppers yesterday.
No, no, age has nothing to do with it!
Textbookいいえ、年齢は関係ないじゃないですか。The textbook 'いいえ' becomes 'いや': not a flat 'no' but a quick 'no, no' launching the rebuttal, capped with casual 'じゃんよ'.
Someone is about to open something that has just turned up.
No, where the heck are you hiding?!
Textbookいいえ、どこに隠れているのですか。"いや" is casual "いいえ", but here it isn't a real "no"; it just launches the comeback.
From other routines in the library. Automatic transcripts, not yet checked line by line.
いや means “no, no…” to start a comeback. いいえ is for forms and classrooms. On stage and in real life, disagreement starts with いや, often doubled to いやいや to wave something off.
With friends: OK. With coworkers: OK. With a boss or teacher: careful. Fine almost anywhere. Doubled いやいや sounds like waving your hands.
In 1,905 live comedy routines, いや appears in 4,413 lines from 249 comedians, and the textbook いいえ in 29 lines.