One amend. Two amends. Not two 'amendses'.
Alternatively I made amends to two people. Count the people instead.
One setter-up. Two setters-up. Not two 'setter-uppers'.
One setter-down. Two setters-down. Not two 'setter-downers'.
Humility. Not 'humbleness'.
Discomfort. Not 'uncomfortability'.
Gratitude. Not 'gratefulness'.
Lest. Rhymes with best not yeast.
I'm in the fellowship. I'm in recovery. I'm in AA. I'm in the programme. [That's what one does not what one is in.] I'm in programme. [Programme is countable like dahlia or beetle not uncountable like sand or anthracite.]