Which of the following words doesn’t appear in the text of Acts?

A packet of coloured pens, but with something missing
Something's missing, by Iain Simmons

Here are the options, the first 3 components of the fruit of the Spirit:

  • Love
  • Joy
  • Peace

The answer, which I learnt from Greg Koukl, does make you wonder. The apostles proclaimed the gospel over and over without using this word, while it seems to be our main selling point today. Have we got something wrong?
Use Bible Gateway’s keyword search or whatever you’re comfortable with and find it out what it is.

(By the way, I checked in the following versions: ESV, HCSB, KJV, NASB, NIV 1984 AND NIV 2011.)