I had the information at my fingertips and hadn't used it.

我手头就有这种信息，而且我还没用到。

《柯林斯英汉双解大词典》

If I hadn't used my calculator I'd have taken longer.

要是我没用计算器，我花的时间就会更多。

youdao

Recently, I donated 20 kg worth of old books that I hadn't used for years.

最近，我捐赠了我多年没有使用的价值20公斤的旧书。

youdao

But it was--It's funny that such a simple idea hadn't been used before.

但这...很有意思的是,如此简单的方式此前从未被使用过

耶鲁公开课 - 金融市场课程节选

He said he hadn't used steroids or other performance-enhancing drugs, contradicting allegations by his former trainer.

WSJ: Roger Clemens Up at Bat in Perjury Retrial

Mr. KEITH JARRETT (Pianist): If Nike hadn't used the words just do it, I mean that is exactly what, you know, is happening there.

NPR: Keith Jarrett's Audience Connection

"Even though we hadn't used the Amway name in nine years, it still had a 90% brand awareness, compared to 3% from Quixtar, " says Lieberman.

FORBES: Magazine Article