small offense; misdeed; indiscretion;
a small and unimportant misdeed;
Don't worry. Your traffic ticket is a pecadillo. It will be a tiny fine.
Peccadillo reminds of armadillo
an armadillo is a small animal
Being late for the meeting is only a peccadillo because your presentation was awesome.
(c) 2015 E. Carruthers