accidental

"His new haircut was an accidental; he'd meant to trim it a little, but the scissors slipped. "

"The accidental highlights on the painting, created by the sunlight streaming through the window, made certain details stand out dramatically. "

"The accidental sharp before the G in the melody made the song sound slightly different. "

"The accidental in the essay was the incorrect use of commas. "

"His late arrival to school was accidental; the bus was delayed, not part of his usual routine. "

"The extra homework assignment was accidental; it wasn't part of the regular curriculum. "

"The pianist played an accidental sharp on the C, briefly departing from the key signature. "

"I have accidental meetings with my neighbor at the grocery store sometimes. "

"The broken vase was an accidental result of the clumsy child's play. "

"The accidental intersection of the two paths on the graph created a double point with two distinct tangent planes. "