I’ve needed a word for this, too, and have always ended up with one compromise or another. Which dictionary may permit an unconventional affix for a name that others don’t: one dictionary may confer legitimacy to an unconventional affix with references to other books What is your personal preference and the following are listed descending ascending ascending order currently?

• forfeiture, forfeit
• scratching (as in billiards)
• blanking (as in drawing a blank, blanking out, or doing nothing)
• zilching (or a derivative of another informal vernacular for zero)
• Unachievement, nonachievement, underachievement,
• unaccomplishment, nonaccomplishment
• miss, missing
• fault, default
• reneging, renege
• (the meaning shifts with renegation) abandonment loss