1832 The fruits of the Spirit are perfections that the Holy Spirit forms in us as the first fruits of eternal glory. The tradition of the Church lists twelve of them: "charity, joy, peace, patience, kindness, goodness, generosity, gentleness, faithfulness, modesty, self-control, chastity."
No mention of forbearance. Next I tried the Simple Prayer Book produced by the CTS:
Charity, Joy, Peace, Patience, Goodness, Kindness, Long-suffering, Mildness, Faith, Modesty, Self-Control, Chastity.
I finally looked up Galatians 5:22-23 (Douay-Rheims)
"But the fruit of the Spirit is, charity, joy, peace, patience, benignity, goodness, longanimity, mildness, faith, modesty, continency, chastity."
Fr. Tim had mentioned to me that forbearance was sometimes described as "long-suffering." By doing a compare-and-contrast, and using a bit of common sense, it seems that forbearance is actually the "generosity" mentioned in the Catechism (not a meaning of the word which had ever occurred to me) and the "longanimity" of the Douay-Rheims.