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[aokugi.livejournal.com]

peccadillo / pek-uh-dil-oh
noun
1. a very minor or slight sin or offense; a trifling fault.

Example: Although the boy's poor behavior was hardly more than a peccadillo, his mother punished him severely.

Origin: 1585–95; < Sp pecadillo, dim. of pecado sin < L peccātum transgression, n. use of neut. of ptp. of peccāre to err, offend

http://dictionary.reference.com/browse/peccadillo